the dilemmas with the ex's are always a bad one. she had just gotten out of a pretty long relationship and it seems like they are still talking. they may or may not be trying to work things out, which is what you're going to have to find out. talk to her and see if she still wants to be with him or is she trying to get over him. be up front with her because in the end you don't want to get burned.
the reason why she is making out with you is because she does have interest in you, but be careful because a lot of the time, after a serious relationship, they are only looking for comfort. raverboy
...this is just my perspective on the situation...