A buddy of mine and I were at a bar and I ran into my best friend's ex-girlfriend. My best friend has a new girlfriend and she has a boyfriend, but my best friend still talks to me about how he still loves his X. This girl is SEXY as hell and was literally grabbing my dick as we would walk through crowds of people! Anyway, my buddy and I were gonna go to another bar and she split up from her friends and came with us. To make a long story short, my buddy, the ex-girlfriend and myself ended up at my house at 4am. My buddy passed out and the girl and I were just finishing a beer and all of a sudden she gets up and jumps on the couch straddling me! We started getting into it and for some reason I stopped myself from having sex with this girl because I thought it would get back to my best friend. Do you think I should have said fuck it and gotten down with her or did I do the right thing out of respect for my friend?