Hugs, Britt. I have many of the same feelings that you do. If you feel like his companion only bc he has nothing better to do -then stop making yourself available to him. You can't leave the house 24/7, but you can do things to occupy your time when you are home together - focus on your boys, get on the computer, read a book, paint your nails, call a friend, scrapbook, take a long bath, watch a movie - do things that you enjoy. And when the opportunity does comes up, keep doing things outside the home.
When my H was still living at home, but after he stated how unhappy he was and after he started becoming distant and being gone as much as possible, I stopped doing all of the housework for him. I figured if he wasn't committed to me and our marriage, I wasn't going to do his laundry, cook his favorite meals, run his errands and that sort of thing. If it's building resentment in you, I think I'd stop doing it or stop doing as much of it.
Me: 34 H: 34 DD: 3 M: 8 yrs H moved out Oct. 2008, "not happy" "don't know what I want" "will always love you, but not in love with you" PA Bomb: April 5, 2010