I'm seeing a married man and need some serious direction. Any advice?

you are certainly going to get some negative views, but you probably already knew that. it seems you really care about him and the son. yes, she has issues as does he. you already are in a relationship with him at this time. look, you understand that he is not going to leave her and that he loves her still. so, he's sleeping with you and won't leave his wife who has mental issues. his solution is that he's going to tell his wife with mental issues that you are going to be a live in nanny? seriously? that's his solution to a dysfunctional situation? take a deep breath and don't worry about all those other responses. you cannot save him. you cannot save his son. and you will not be helping her. every minute you continue this relationship (both sexual and the babysitter job), you are giving in to a fantasy, cause he won't leave his wife for you. as much as you think you know this man, you really don't. at some point, he will hurt you; or his wife will hurt you; either way, you will be hurt in the end. don't ever think that just because his child calls you mommy, that's a sign of things to come. make the hard decision and walk away. you will be better for it.