I had sex with my guy best friend who has a girlfriend.
I've been really close with my guy best friend for a while. He had recently gotten a girlfriend and everything was good between them. I thought they were good for each other. Well one night a few months ago, after a few drinks were involved, me and my guy best friend ended up having sex. I never saw this coming. I felt so guilty afterwards because I knew he had a girlfriend and I let it happen. More so, I can't believe he let it happen! We were just friends and I don't understand how it happened. But after it happened he left for the army. The only way we could talk was through letters and he'd write to me telling me how he wanted it to happen again when he came home. How could he say all that knowing he has a girlfriend? I won't lie, I started to developing this physical attraction to him but nothing more. I've thought about having sex with him over and over, but I feel to guilty. His girlfriend is a nice girl and I don't want to do that to her. But I feel like once he comes home it could happen again. I do and I don't want it to happen. Am I a bad person for wanting the sex even though he has a girl? I don't know what to do! Or what to think! Is he just using me? I'm so confused!!