Badger, i'm really not a fan of cheating either, to be honest. For a long time i wouldn't deal with anyone who was married or whose wife/gf/partner/etc didn't know what was going on. Then it just kind of happens. Of course i know the risks involved, but i also tend to think better of people and think that they'll pay me the same courtesies - in any situation - that i would pay to them. Clearly this is not the case here.
Everyone else, thank you for your thoughts - they pretty much confirm my own feelings and makes me feel validated. Your support and words have given me lots to think about, thank you *hugs*