You are so right, you cannot control him, just yourself. You may forget this line every once in a while, especially when he does something so crazy. But keep it front and center and mentally you won't be dragged down to his level.
Me: 42 H: 45 M: 18 yrs T: 20 yrs D: 17 D: 15 S: 12 I kicked him out 8/21/15 I will DB until March 21st 2017, that is it!