Muslim fiancé has a dirty past

Hello,
I have been in a long distance relationship with a Muslim woman for 2 years now. I met her on a casual dating app. I have traveled to meet her in person and also met her family and friends who all accept me with open arms. Our love and passion for each other is very strong and we plan on staying together for the rest of our lives. She is sweet warm and forgiving of me and my mistakes. We have plans to get married.
My only problem is this. When we first met i noticed she was very active on social media with many men followers (thousands) and when i asked her about it she always shrugged it off. I knew in my heart that at least a few of these men would send her messages and try to flirt with her. When i expressed my concerns to her she would tell me they are all just random people and there was nothing strange going on. I told her that if i was going to commit to a relationship that i wouldn't tolerate this behavior. I had told her every detail about my past and assured her that i had severed ties with any other woman. Still she resisted and dismissed my concerns about all these men. She even changed her privacy settings so i couldn't see her activity because i was clearly uncomfortable with her online habits. EVENTUALLY, after many painful conversations, she agreed to delete other men from her social media. Well when i checked there were still a few that remained. She admitted that these men were her “friends” who she messaged and talked to. This did not sit well with me and once again we had many arguments over it. She would spend hours a day scrolling through IG liking commenting and following men showing off their bodies. Finally later she had admitted to me that these men were guys she had video sex with in the past but told me they are just friends now. I warned her that lying to me about it had destroyed my trust. It took much convincing and arguing and she eventually deleted her IG. I also later found out that she would had MANY online sex partners. It turns out she used almost every social media app including telegram and snapchat for meeting men and having video sex. Some of which still messaged her. When we would video call she would pause our conversations to respond to their messages. I told her that i wanted to leave the relationship and she cried and begged me to stay.
Fast forward to today. She has deleted all her apps and I do tend to believe she has changed her ways.
Im far from perfect and i understand all humans are flawed, i just really struggle to understand how she can be so deeply religious and pray regularly while having such promiscuous tendencies. I have spoken openly with her about it in an effort to understand her way of thinking but she just gives a very general and generic blanket apology. She refuses to go into detail about how she ended up down such a dirty path. I will never know how many guys have laid their lusting eyes on my woman's body and that bothers me a lot. It makes everything worse how she continued contact with them while claiming to be loyal to me. Her extensive lying to me during that time has tarnished my trust and it still weighs heavy on my heart no matter how much time passes. Every situation that reminds me of her past behavior makes me recall every disgusting thing she has done amd all the lies she told me. Even though i feel she has truly changed now, its like she has a second lustful personality that makes me worry her eyes will always wander and possibly cheat or keep secrets in the future. She seems desperate to convince me she is changed and loyal now but its still burned into my mind.
Questions:
If my heart truly loves her but i cant trust her, how can i let go of the disgusting memories and even remembering the mens names and faces? It’s like I'm a fool being mocked and laughed at by men who used my beloved partner for casual sex. Im constantly thinking about it every time anything reminds me of her behavior.
If she is so religious, how did she find it acceptable to lust after so many men even while she claimed to love me and be loyal to me?
If a woman is so comfortable keeping secrets and covering up her lust, can she ever be trusted? Is she just a lustful woman with no loyalty? She has a warm heart but it breaks my soul to imagine her performing on cam for so many men around the world.
In another post i read that Islam suggests “keeping the past in the past” but the past traveled into our relationship and damaged trust. What does Islam say about promiscuous women who lie to their partners?

If this lady is your fiancé then you should be more supportive. Her past experiences are what have made her the women you have fell in love with.
We have all done things we regret in our lives or actions that have bought along lessons that have made us better humans. In her life before she met you, she has explored her sexuality which is a perfectly healthy thing to do. It is possible to be religious and also indulged yourself. I don’t particularly agree with you making her delete her social media as I think that is unhealthy. Social media is a great tool to demonstrate your love to each other and also ensure a healthy social life. Also women are not possessions and therefore have the right to do whatever they wish. A loving partner is there to add to each others lives and not take away. By doing this you will only grow resentment within eachother.
As other commenters have mentioned, if you feel you have no trust in her then you are best apart. I believe you are the issue if you don’t have trust despite her deleting everything in an act of love to you, which I don’t believe to be the correct solution
I do see your side but I do implore you to put yourself into her shoes and also to not make her feel awful about previous actions as none of us are perfect

It’s not that I want to torture her or control her. I made my standards and expectations clear in the beginning. She had every opportunity to establish loyalty and trust, but she chose to build a foundation on lies. I agree social media can be away to express love and share memories together, especially in a long-distance relationship, but how can I respect her social media when the sole purpose of it was for flirting, and having sex with men? Should I have ignored my own standards and accepted that my partner will keep contact with thousands of men that want to use her body for sexual pleasure? My goal isn’t to change her as a human being, however, every person reserves the right to walk away. I told her in the beginning if my boundaries were not respected that I would walk away. I suppose it is a show of my weakness that I have stayed and continued to try to work through it.

Just my take but pretty much sounds like you despise her and always will.

I can see where your coming from the foundation of lies and a lack of honesty has caused that inability to trust her and I don’t blame you, without speaking the truth and not being honest here in a matter that is considered quite major not minor for all we know she could be hiding her true colours, intentions even. The social media bit a form of love and sharing memories maybe over a long distance relationship communication wise yes, but where’s the affectionate side of social media…But yeah you are spot on in saying with the intention to flirt and sexual desires with men over socials respect here hard to give. Never ignore your standards my brother you know what you are worth, from the sounds of it your a pure brother just rightfully wanting the affection and attention of your own woman nothing wrong with that my brother, your only doing the correct thing in ensuring that the thousands of men don’t use her body for sexual desires or pleasure. Whilst your goal is not to change her as a human being, you can most certainly lead by example bring her to track ensure that she’s on Deen, and that who knows she may just give up socials for good. Yes you do have the right to walk away and rightfully so. Don’t get me wrong every relationship has its boundaries to be abided by and followed the least she can do is respect that and follow that. No my brother it’s not a sign of your weakness you stayed and continued to work through it she’s just failed to abide and follow it, you’ve given her a chance she failed to take it and do so. You love her it ain’t your fault you just wanted to make things work and rightfully so by giving her a chance and opportunity yet not only did she respect that she failed to do anything about it.

Much appreciate your understanding my brother. Many people dont understand me and would consider me to be controlling but thats not true at all. If she strays away i will never beg her to change. I would just observe and disappear from her life when my limit is reached. Its called having self respect and integrity