Believe me...I understand what all this feels like because I was there for almost 2 years....My H is now back and after almost 3 years has finally said "I love you" to me again....on our 27th anniversary...
I went through crap...no I miss you's...he says that is a woman thing....no money for me and the kids when he was "gone"....he had a new BMW...an apartment by the beach....home theater system...cable...blackberry...you know, he had it all and I was struggling to put a roof over my kids heads...
I am still struggling because mentally he is not totally well yet of course he is not physically well either...and the two seem to go hand in hand....
Give you H space...it sounds like he is close...as long as he knows he has a home to come to he will be ok...also...good idea for him to break with OW and go to mom's for a bit...straight across isn't such a good idea....they need to get over "her" without complicating things with you...