Kitty,
I went thru a time in my life after my ex and I separated that I could not BEAR to be in my apt alone. As soon as I came home from work I was out the door to go to the mall, a movie, anywhere but HOME ALONE. After some time in Al Anon, I realized I was keeping myself busy so as not to slow down, relax and look at the pain in my life. That may be what your ex is doing now... but sooner or later things tend to catch up with you.
Take time to get yourself happy, healthy and whole. Not only will you feel better than ever, it may just be the best revenge as well!
HUGS from me
O59