Long time lurker here... I have been having sex with a guy (who is well-endowed by the way) who just asked his girlfriend to marry him. He tells me that he only asked her to marry him so that she wouldn't leave him. I knew he was with her, actually, it started off just being friendly, when she was out of town, or when they were on breaks etc which is quite often. Problem is, I can't seem to stop myself from screwing him. I know it is wrong, and I have told him several times that I want to stop, but then he comes over and well...you get the idea. So now, his girlfriend asked me to be a bridesmaid in their wedding party. Am I just digging myself in deeper, no pun intended? I know this isn't your regular stuff here, but it is really eating at me!