Do you think she can really move on from her ex?

In my final year of college, I met a girl (23) when I had no plans to get into a relationship. I'm a typical "green flag" with no history of doing anything wrong in matters of love. We connected very easily and spent hours together. A few months went by effortlessly. At first, she told me she had past relationships but didn't mention getting physical. Later, she revealed she had physical relations, which was fine by me, but the delayed disclosure made me feel confused. I became somewhat obsessed with her. We spent too much time together, neglecting our personal commitments. I found out she was still connected with her ex by persistently questioning her and checking on her because I had my doubts. She said she never properly left her ex, didn't get closure, and that her ex is a toxic guy who controls women. She was about to end it with him as she found a partner she could see herself marrying. This felt like cheating to me. I felt betrayed because while she was texting her ex (only arguing, not meeting or being romantic), I was having all the lovey-dovey conversations with her, and it felt like a lie. I'm dedicated and have done everything in my life perfectly once I plan it. This was my second relationship ever. I want to know your opinions. Do you think she can really move on from her ex? She cries and tries to stay connected with him despite his toxicity. I wonder if she can really love me. I'm at a stage where I need to get my life straight, as getting caught up in something hurtful could risk my career. I love her for the time we've spent, and she's generally a good, caring person, but in this matter, she seems problematic. I have advised her in every way I can, but her past keeps coming back, and I know she's hurting. This cycle continues, and I feel bad about it.