They feel great at the beginning, the more you do (him) the better you feel. For a while. Then it becomes more difficult to get as much as you need and it becomes a love/hate relationship. One day you look into the mirror and discover you're hooked, but not feeling good anymore.
Then it's time to quit.
And that's when the real pain sets in.
But just like in rehab, if you focus on what you used to do to feel good; the really important things, the pain goes away and you discover yourself again.
(I'm still in rehab...but working like crazy to get back to myself.)