when she is in a relationship and she is in a dark place and needs a comfort blanket the first person you go to is current partner not ur ex. "she would say things like marriage to keep her around." why did she want to keep her around, this is trying to tell me that the ex was prepared to let her go but she enticed her by saying things like i love you and want to marry you. You said that from what vibe she gives off "she seemed like she didnt love this ex" could be she is a attention seeker and is trying to use her ex for something else in exchange as the sex is nothing to her but, obvs the ex is not over her and she is using this to her advantage to get what she wants from her, but just do not know what exactly she wants from her. what is her end goal - is she is trying to use her for something in return? it does sound like the ex was a very submissive partner and she was probably dominant, but i could be totally wrong. does she enjoy the feeling of dominating someone and makes her feel happy and likes the fact of bossing someone around makes her feel wanted in some sort of way that she is above someone, like a urge for power. but one way or another she was having sex and relations with her and telling her that she loves her and want to marry her to keep her close and stop her from saying goodbye only to use her for her own pleasure. shes manipulating her and playing mind tricks with her for her own pleasure and satisfaction, but what i dont understand what does she have to gain from all this if shes not intereated in sex and she doesnt really love her, is she innit for the money? she should confide in you. but whatever you do dont question yourself, your not to blame and dont be saying to yourself "oh why" and questioning certain things it will run your brain crazy she is the one to blame and the only one. but be aware and keep your eyes wide open. dont try and get charmed by her spell and you need to stand your ground. she is either a attention seeker and loves getting spoiled and attention from someone else and loves the fact someone else is at their feet obeying them or she is just using them for her own pleasure/ gain trying to get something out of them. do you know your girlfriends secrets or was you together when she was in a dark place how long have you been together with her.
what it dont make sense a big no no is that stuck out was the fact that "she said she would say things like marriage to keep her around." Keep her around, why did her ex not want her around her? and she just wanted her around so badly that she was talking about marriage to keep her around. keep her aound for what. why does she want to keep her around. esp if she dont love her, she sees the sex as meaningless and is prepared to leave her now for you all of a sudden because you caught ger out why couldnt she leave her before why now only when she is caught out. and talking about marriage to someone else is just mind blowing esp to someone you have no feekings for apparently. it is hella confusing. is she actually prepared to leave her for you or is she just saying that to get you back in her good books. alot of things to think over and consider. is your girlfriend very manipulative/controlling. and in the trxt ask her if she is prepared to leave you for her ex.
personally i wouldnt bother with a women like her and she is worth your tears.