you might be giving him a bit too much credit for being some evil mastermind intentionally messing with you.
he's an alcoholic, and "woe is me" is their battle cry. also since you have stayed and stayed, done more and more, while he does less and less, he's pretty certain you aren't going anywhere. so he can drink and argue about gravity and that can sum up his contribution.
hang on to those thoughts of what things are like when he IS not there. that CAN be your life.....it will just take some doing to GET there. leaving isn't as easy as grabbing a toothbrush and fresh undies.......