There is the option to block him from facebook - that way you can't see his activity on there at all and he can't see yours. You are entitled to interact with your friends without feeling the temptation of contacting him. If you can't then perhaps giving facebook a rest would help. I temporarily disabled mine when I was first separating from AH - because I didn't want to do or say anything on there that I may regret later.
My current status on there is the serenty prayer. Lots of my real life friends "Like" it.
