Alright, so I was dating this girl for 2 and a half years, and about 6 months ago I broke up with her because I found out she had cheated on me and was constantly lying. Well about 2 weeks ago she sent me a text saying "i know this is really late, but better then never. I'm sorry I was such a horrible girlfriend, blah blah blah..." So we have been texting ever since, I no longer have feelings for her but apparently she has some for me still. But she has been dating a guy for a couple months and claims to be deeply in love with him. Well, tonight she came over and we umm. did it... And that was the whole reason for her coming over. But right when we got done she was like "im such a horrible girlfriend" "im going to hell" and all this shit. Stuff you really dont want to hear right after you had sex with a girl that had a boyfriend. But now that you know that, should I be feeling guilty? Because I kind of do. I know how bad it sucks when she cheated on me, and I am kinda feeling bad since I was involved with her cheating on her current boyfriend. And should I keep doing it?