Your H knows that contact and intimacy will suck you back in...he just doesn't care. He truly has the best of both worlds. He has OW and his son and he has you to sleep with and be there to inflate is overinflated ego.
You can do this....move on without him. If he comes around then reevaluate then. If not, then you are happier.
Me: 46 FWS: 36 Married and Divorced 4/07, Pregnant 7/07,False R 7/07 Baby Girl born 3/08 Kicked him out because OW: 7/08 5/10 He realized what he had and lost. Moved home! REMARRIED 3/14/11!!