***Hate to be the one who asks, but does she like me***?

Sounds like she wants the emotional connection, but not necessarily the physical connection. She's meeting her boyfriend duties between the two of you. Meaning she wants to sleep with her ex for the physical requirements and have you fulfill the emotional requirements. This could mean that she isn't looking for commitment and just wants to have fun or she just doesn't find you physically attractive. It sounds like she likes you, but she seems sociopathic in the way she regards people. Even if she did give you the time of day you're better off walking away because it will blow up in your face somewhere down the road. People like that have little regard for consequence and a lot of good people tend to get caught in the crossfire. The fact that she has a boyfriend and is running around on some kind of emotional escapade with you is kind of a dead give away.