Is it possible to withdraw from pot? pls read 10 points betst answer?

my boyfriend has been a recovering alcoholic for three years now. He dealt with not drinking by replacing it with pot and smoking it every waking minute of the day. when he is on that stuff he seems normal. I hate being around him when he runs out. It sucks because I live with him and I have to put up with it. It's like dr hyde vs jekel. He becomes irritable and starts treating me like crap. He also starts arguing with his friends and family really bad. When he runs out, I avoid him as much as possible and walk on egg shells because he starts getting mad at everything. When I ask him if he is withdrawing from his pot, he gets so defensive. He swears he is only irritable because of me or who ever else happens to piss him off. When he finally gets his fix, he realizes what a jerk he was and starts apologizing to every one. IF there is such a thing as a with draw from this, then that sucks. I always though it was mellow and non habit forming