You need to expose their affair to her supervisors -- PERIOD. Preferably with a copy to the State licensing review board as well.
This is the first I'm hearing about physical abuse. If that's the case, you need to GET OUT -- NOW. Do you have someone with whom you can stay?
EO, he is still lying to you. A cheater will always lie --ALWAYS -- and you can be assured that he's only telling you things in dribs and drabs, AS HE NEEDS TO (as you confront him with proof). I suspect there's at LEAST half of it you don't know.
