I think there is something wrong about me

So basically, I have dated one girl for a month and a half,which I met through one my female friend, everything was great from the get go, we meet 4 times, texted every day, and suddenly she started to distance herself after last date (soft ghosting) and then ghosted me for real. I reached out to her after 10 days to ask her out one last time, she rejected me "officialy".
I was devastated absoulutely, because I thought it was going somewhere and everything was great and there was potential. It was a time of christmas and I felt like ****, **** got the worst out of me, and I reached out to her 3 weeks later asking for some kind of "closure" asking her what went wrong that I would like to know the reason, because it really bugged me, couldnt think straight. She didnt reply, it only made things worse for me and complicated my healing. There weeks after sending her that message I got sooo drunk unintentionaly and send her random message at 4am (i dont know what i sent, i deleted it immediately). That thing got me even more devasted. I was obsessed what she thinks of me right know after all of that....
Somehow I recollected myself and almost 4 months later I was on the same project as her friend through which I met her. She laughed all the time to my jokes, even laughing for no reason across the table when we made a brief eye contact, repeating my jokes.... I didnt want to ask her about my "ex" after all I did, but eventually she asked me 2 days before the end of a porject on a random ocassions questions like: Is there any bad blood and did I fall in love? I was soo confused by those questions and didnt expect her to ask me on those last days, because I thought she would have asked me before and she caught me unprepared.
I said we were seeing each other for one period and were texting and after that I dont know what happened, after I mentioned it again she just interrupted me...She even asked me why I didnt make out with one girl on project thhat showed interest in me, like thats none of her business. I said I didnt fall in love(even though I did) but had great time with her, and there is no bad blood. The q did i fall in love shocked me and I was so confused what to answer that I forgot to ask her why she is asking me those type of questions, and our conversations was interrupted by one participant.
I was so confused after those questions, is my "ex" asking about my through her or is this friend interested in me(like why would she want to know if i fell in love after almost 4 months??) On the last day of project I asked her friend if she wants to grab a coffe someday, she said like she has to check her schedule, that "that who asks doesnt wonder" and the same day she posted me on her story with some random silly caption" and when she left she said mybe 2/3 times that we dont have to say goodbye, that we will see each other again. Ok, i thought she was reffering to my invitation and considered it as somewhat of a "yes". I reached to her 10 days later to see if we are going to see each other, and she said she said she has college stuff to do. It probably ended up looking like I was hitting on her friend, but giving the context I dont know what to think anymore it also looked Like i wanted to hear more about my "ex"... It also makes me frustrated that her friend wants to get info out of me, but I cant get any info in return, like she would have said it if she wanted to...
2 months after that I dont know what to think after all of that, did my "ex" wanted something or was friend innocently curios?? It bugs me soo much, I somewhat "like" to ruminate about all of that,even after 6 months after she rejected me, I recognized that about myself since we clicked soo much, and never felt that kind of instant attraction with my "ex".... It is my fault that I still ruminate about that after so much time but still...