joko's right. What exactly is the problem, whoopy? I'm not being sarcastic, just wondering what it was that's changed your view of him. Was it because you let yourself go in a way you wouldn't normally do? (In which case it's not exactly his fault.) Or because he did something unusual? You can't change what's done, but rather than drop him, you should certainly tell him you regretted it (so he won't expect it to happen again) but otherwise try to go on as before. Of course things have changed, but things change all the time, you learn new things about friends every day; but the fact that they have sex shouldn't normally be a relationship-breaker.