I'm sorry broken...
I was thinking of you when you posted, put on the smiles and act like the happy family, in so far as you being the one this is killing. I hate to think of him getting the best of both worlds, coming home to "the family" and doing what he wants and leaving for the work week and doing what he wants there. Try to begin thinking of him as the man he really is now. Do you love him the way he is now? You can mourn the loss of that man and the love you had, which is different than thinking you are still in love with the man he is now.