Well when we had sex she didn't live with the roommate she just hung out with Kay. I didn't know what she was up to. Not to long after we did it I got the flu and was out for about 2 weeks and then I was out of town for two weeks so we didn't see each other for about a month. I didn't really intentionally dump her, we just kinda stopped talking.
You are right I should cut ties with my ex and I am not trying to say the way I handled things was right or anything I am proud of (in fact I really feel like a jerk). I don't want to just cause problems with the roommates because they are getting along. It's just weird to know that she is being deceived by her roommate, and wondering if I should let her know or not and maybe she could have time to find a new place. It's not so much that I want to tell her because I feel guilty it more about her knowing the truth and whether that is a good idea or not. I do not know that is why I am asking the fine people of Curezone.
I have a problem with trying to make everyone happy and it usually bites me in the ass like what happened here.