OMG, Tay. Seriously, file for D and soon. Do a search today for "free consultation divorce lawyeres" in your area nad go tomorrow.
Your H is a d-ck. I am sorry but there are no words to approprirate describe what scum he is.
IMO, the OW never had a boyf. They just told you that to "ease" the pain of their affrair and to make excuses. Your H is prob the father. Anyone else think this?
Get a L and file for support and fast. Keep your head held up really high and do not speak to him again unless it involves something re: your children. He is not even man enough to tell them about what he's doing which is pathetic.

Big big hugs going your way.