Should I discuss what happened with him, or just leave it be?

you should discuss the issue with him . Never leave an issue unresolved . If after the discussion you feel the same way then it is time to walk away . If after the discussion you feel differently then you haven't prematurely ended something that may well be beautiful. Too often we act in haste without thinking through the possible ramifications of our actions. A polite but friendly conversation with the guy will reveal to you where to head from here. good luck and god bless. ps ,you weren't an item ; so even though he was your date he was still a free agent . Regardless of that, I bet nothing happened between him an Amy except for the conversation. As you chose to leave him in the room and not invite him to retire with you ; he was at a loss as to what to do . Does he follow you into your room; uninvited; or just sit out there where he is and be a gentleman . Then comes the other girl ; drunk and weepy ; whats a guy to do ,but try and console her; Too many mixed emotions . Meet with him and at least clear the air. You may be pleasantly surprised as to how much a gentleman he really is. hope this helps.