I have a scenario with a friend, my ex, and his girlfriend. It's a little complex so I'll try to boil it down so it's easier to read. Peter is a friend of mine. I've known him for a few years. We aren't great friends. I've never called him up and asked to hang out. But he is a buddy of a buddy of mine and for the most part he has seemed like a good guy. Katie is Peter's girlfriend. They have been together for 5 years. Katie has middle-eastern roots and is smoking hot. Melissa is my ex. We dated for 2 years. We talk on occassion and have had some booty calls since our breakup but we are not together. The breakdown: A couple months ago my friends rounded up the troops to go to the bar. Peter was there, and someone invited my ex Melissa to come. I hadn't seen her in a while, but I didn't think too much of it at the time. While we were at the bar, I was drinking and just maintaining a buzz. Melissa was getting pretty drunk. Peter was pretty drunk too. For some reason, Peter's girlfriend Katie wasn't there. Melissa was all over Peter. Sitting on his lap, whispering in his ear and staring at me while she did it. I didn't care so much about her being with another guy, but it irritated me that she was doing it to my friend and that she seemed to be intentionally trying to hurt me. We stay until bar close and then head back to a friends house. Melissa is still all over Peter. When we get back to the house, the two of them disappear for the night. I find out later that Peter fucked Melissa. Fast forward a few weeks. I am hanging out at a friends house and I am sober cab for the night. Peter is not there, but his girlfriend Katie is there. She looks really good, but she's drunk. She is flirting with me pretty hardcore, and at the end of the night she tells me she has a secret and tells me to come closer to her. She reaches out and touches my face and tries to kiss me. I turn away. She asks what's wrong and I tell her I can't do that to Peter. She continues to try to hook up with me but I continue to politely deny her the rest of the night. We go out again to the bar a couple days later and Katie is there again without Peter and she is all over me again. I'm sitting at the bar and she pulls up a chair right next to me and starts rubbing on my leg and tries to go up to my crotch. It was tough but I denied her again. As bad as I wanted to take her home and let her have it, I just couldn't. Now recently I've been thinking about Peter hooking up with my ex and it's starting to piss me off more and more, and I'm wondering if I should have just banged Katie. What would OT do? Cliffs: My friend bangs my ex when he has a girlfriend. His girlfriend wants to bang me but I deny her even though I know what my friend has done. Now I'm having second thoughts.