You can't stop because you still haven't let go of him, not completely. It's a process that takes a lot of time, especially after the way things ended (I remember your other thread about this). Not contacting him is a first step, and good on you for having the strength to do that!

What do you want or expect to see when you go to his Facebook page? Is it just that you want to see his face? What he's up to? Clues that he moved on? Or maybe, God forbid, clues that he's regretting the breakup?