I am going through this now. H *never* once has stayed with the kids on a weekend night. He goes out, no questions asked. I finally got a sitter and started going out on my own. Now, lately, on his off days, he is more and more absent. I am starting to think (obsess) that maybe my H is doing the same thing, knows I am at home, so I can't get in 'trouble'. Mostly he is just using me, knowing the kids are happy and healthy with me, while he lives his single life.