So, I'm in kind of a weird situation where this casual, and relatively new, friend has started coming on to me pretty strongly out of the blue. I mean REALLY strongly and REALLY unexpectedly. The thing is, the casual friend is in a relationship. You'd think if he were attempting to fool around behind his wife's back, he'd be discrete about it (and he has IMed me privately a couple times), but a lot of it is largely over Facebook where his wife could totally see it if she happened to just wander onto my profile (because I'm friends with her, too). The whole thing leaves me a little confused. If it's just the way he is and doesn't mean anything by it, or he's maybe in an open relationship or something, I don't want to jump his ass or rudely ignore him, but I also do not want to inadvertently get caught up in a messy affair situation by continuing to be friendly with him if his intentions are, er, dishonorable.
So, should I just ask him wtf is up? Just stop responding to him in any fashion? This is stupid, but I don't really know how to approach it.