Mine does the same. Comes in here, works on my PC, uses my bathroom, naps on my bed/couch etc etc. These last weeks, I stopped that without even saying a word. He doesn't like it. Today when he picked up the kids, I didn't offer coffee, got them ready and said, "time for you guys to go have fun" and showed him the door.
Well, I guess that's what divorce is all about, right? K