I've been dating a new guy, "Guy", for about 2-3 weeks, although we first kissed about 4 weeks ago. He's a friend of a friend and I've been told that he's a really nice guy. I recently found out that Guy ended his last relationship 1 week ago. Should I be concerned? He explained to me that the relationship was over at least a month ago and had only seen the girlfriend once in the past 2 weeks. He officially had "the talk" with her last week and ended it for good. I'm worried for a number of reasons. (1) He misrepresented himself to me, which is understandable to me b/c there's no way I would have gone out with him had I known. (2) He cheated on his girlfriend. This is a black and white issue to me; some people see this a shade of grey since the relationship was essentially over. (3) I'm wary of people who overlap relationships. Why stay in a relationship you don't want to be in? Is it really over? Does she think it's over? Does he really like me or does he just need to be in a relationship?

Am I making a big deal out of nothing? Or am I setting myself up to get hurt?