So I wrote before about a guy I met... that had a girlfriend... well come to find out... hes actually married... hes been with her for 10 years and married for 3... but I'm crazy about him... we have been seeing each other for 3 months now and I feel like we are together more then he and his wife... which he prefers... thats not it... he has a 16 month old son... we have tal\ken our kids out together and I know that is a big no-no... but I wanted to... I know this is wrong and when I ask him if he ever thinks he'll leave he says he needs a reason... I tell him that I would never be with him because of what he's doing to his wife... ehhh I'm so confused... hes a great guy and we have the best time together... and I eventually want to find someone... but is it OK to just do this for fun now??

I suggest you try to stay as far away from this guy as possible. He may be a great guy, but he's a great guy betraying his wife and using you. If he loved you, that would be reason enough to leave his wife. Furthermore, what happens if he does leave her for you? Will you be happy for a few years and then find out he's now cheating on you? Do you really want to put yourself through that? Sorry if I'm being harsh, but I don't see anything good coming from you staying "with" this guy.