My girlfriend couldn’t get over her ex. What should I do?

I met her on an online dating platform because for some reason I couldn’t get a girlfriend no matter how hard I have tried. She is my first girlfriend. I asked her if she has an ex. She told me she had one whom was abusive, player bad boy who uses her for his sexual pleasure. I assured her I’m nothing like him so I accepted her as my girlfriend but we hadn’t gone out on a date yet because she wanted to know more about me first due to her traumatic experience. Then days later she couldn’t stop talking about him. She kept telling me how he is trash and she wished his mom died. I read her messages and I pitied her for suffering so much. I have given her a chance because I believe there’s something about her which made me attracted to her. She’s nice to me in her messages but likes to insult her ex boyfriend. His first name is Jordon. She’s also someone who cares about me deeply, she also knew about my past because I told her how I was bullied because I was a small weak guy. Now I lift heavy weights because that trauma struck me for ages. I’m more slightly bigger in size but at least I’m not small and weak. What struck me the most wasn’t her ex but how she wants to be dominant in bed. I was beaming because I love dominant women. The thing is, she is a virgin so she admitted she has no idea how to do it. I’m a virgin too because I’m a shy young man with no sexual experience whatsoever. I believe she’s a good person but I’m not sure if I should marry her in the future. Should I break up with her? I don’t wanna hurt her feelings. I need some advice please, thank you.

Updates
11 mo
Another thing I forgot to add is: She didn’t know I’m secretly creating an account here to ask questions about dating because if she were to know she would get upset. It’s not cheating but I just wanna know more.
My girlfriend couldn’t get over her ex. What should I do?
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