Why DON'T you start going to the gym for four hours?
I'm serious - ever wonder what would happen if yoiu started mirroring his behavior? If he goes out - you go out too and be gone longer. Come home after him. Let him start to wonder and worry a little bit about where you are.
Go to the grocery store and come home late - without groceries. lol!
I have done that and I am not a good liar....always come clean about where I've been! Need to work on that skill perhaps.
Me - 49 H - 56 S - 23 D - 20 Married 25 years H moved out 10/11/13 H moved back in 10/13/13 H moved out again 8/1/14