<human>: Can you summarize the given text in a few sentences?

Okay, so let me start out by saying that I'm still angry while I write this so I'm not in the clearest of mind. Anyways I will start out by saying my gf lets say her name is Becca. Becca and I met and were friends for about a week before we started dating. So it was not long... I found out she was still in a relationship. I was the bad guy for getting in the middle of it all. I'm now paying the price of dating Becca. Becca and I have had a great relationship, but as of right now we have a few issues. That keep resurfacing. There is another guy in the picture still, that being her ex-bf. I understand and knew that this would most likely happen. But I continued anyways based on my feelings for Becca.
     But they talk everyday and keep in contact. We fight about and she said it's hard, and she's working on it. But I don't see progress. I feel like I'm disrespecting myself for letting this happen. I feel walked over, and that she doesn't care about how it makes me feel cause she continues to do it. I don't know if I should bother to stay around anymore or just try to let go. I really care and love her, but that doesn't make up for her choices to continue to keep constant contact. I for one know the mistake I made with going after a girl in a relationship. This is the price I might have to pay. But I want to hear some other opinions on this. Or if anyone has had to deal with this sort of situation before and what was the outcome.
<bot>: girlfriend keeps in constant contact with ex bf everyday she knows I don't like it. She says shes trying to stop. I care and love her but feel walked on.