Get a life.
No seriously, i dont want to be rude, it is really that simple. I will explain further: find new hobbies, for example start going to the gym regularly twice a week, go to a pub every friday, have a romantic evening with your girlfriend every saturday, read a book every sunday etc. Now you are left with about two days where you have nothing to do. If there is really nothing you can do, play games. The important thing is to put gaming as low as possible on your priority list - do not pass on a party invitation just because there is a raid planned in your WoW guild or you planned to beat that highscore in whatever games you play. Go to the party!
This is how i keep a healthy game-life balance. Of course the above list is just an example, you can do whatever you want, just find something not related to games that you will enjoy and do it regularly. Find two or three such things and you will soon find out that the world out there is the most exciting adventure ever created - no game can compete with it.