HUGS LO, this must be so tough to live with H in the same house. It is funny on his reply on the dating thing. Have he noticed that you are attracting people around you?
If you do expose the A, I would hope H would agree to do it. After all, like you said, he made the mess. If you expose it, when people start blaming him (of course they will), he will again blame it on "what you said", "the way you said it", etc. etc.
Yeah for you setting up childcare schedule. Go have some fun, girl.