That (telling her) is what concerns me as well. I have had crushes before, and they never moved beyond the "hehe, he is cute" phase. At this point, or at least when this happened, I believe he was aware that she was ready to leave her boyfriend for him and he chose to stay with me. I told him several times, when I found out, to go be with her. So far he has decided to stay with me, I just don't feel fully convinced that I want to stay with him. I'm having a very hard time moving past this. Mostly because I am extremely concerned about his boundaries, they knew each other liked each other but even though they never acted on it, I feel betrayed.