Why do broken girls go back to abusive guys?

I met this girl when she was in a bad relationship. They have a toddler but aren’t married. She confided in me and I helped to find her resources to leave and start new. Rather than do that, she falls in love with me and we talk about having a life together. When I’m away on a trip, they break up and we talk about her moving in with me, but before I get back, she goes back to him and he finds out about us. He forbids her from talking to me again and so I never saw her or talked to her for the most part of a year. She reached out here and there, saying “we miss you” but nothing came from it. I held on to hope all this time. A year later, we see each other and she acts like she never had feelings for me and says a relationship with me wouldn’t be sustainable. When saying goodbye, she told me she loved me. Now she reaches out every couple months but it’s just as a friend like we never had feelings before. I’m devastated and wonder why if that can even be answered. I have the resources and ability to give her a good life, I love her, and we get along so well but she won’t break from this guy no matter what. It kills me.

Why do broken girls go back to abusive guys?
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