<human>: Can you condense the text into a few key points?

This girl is cheating on her boyfriend with me from time to time. It has been going on for maybe three weeks with one instance of sex and the rest mostly kissing and feeling up, along with spending time together. 

I am obviously attracted physically but am unsure about mentally/emotionally because I have only known her when she is with someone else. She has been with this other guy for a while and says that there is nothing wrong with the relationship. She makes it apparent that I don't know what I want and that I should figure that out before we go anywhere else.

At the same time I could say she is unsure of what she wants because of her situation. Yet this situation has happened with her and me in the past when she was with someone else (I was going to leave town for half a year). She says she has always liked me and feels bad doing what we do. She also says that I am a bad influence when she is also participating in the acts; I am not forcing anything on her. Is she just the type of person to cheat or is she caught in a difficult place?
<bot>: Girl cheating on boyfriend with me. I would have trust issues with her if we were together. Any advice to know if she is really interested?