My W does the same thing to me. We still live together until the house thing pans out. She started dating a co-worker of hers and she comes and goes whenever she wants. I stopped asking but I feel your pain. I still wonder when she'll be home.
It's funny though when I go out she asks how late I'll be. I'm not sure why she asks or her motives. I've finally dropped the rope and I suggest you do the same. I'm convinced that this will help me heal and move on with my life. I hope you can do the same.
M: 36 W: 29 S: 2.5 EA: 2/2010 OM1 D Bomb: 3/2010 PA: 6/2010 OM2 W moved out 8/2010 Loc: DE, USA
