Relantionship Advice.?

I've been dating my boyfriend for going on seven years now, since I was fifteen and he was sixteen.

He's recently gotten hard into smoking weed, the legal stuff that you can buy in smoke shops...but still its twenty bucks each time and he buys it four to five times a week. He lies about money, steals mine when he blows all his and I'm done with it. I've told him before that I cant deal with him smoking constantly. AND it is constantly. He'll sit in the garage (I wont let him smoke in my house) for hours, pass out from smoking too much and when he wakes up he'll smoke more. I cant talk to him when he's high, he just forgets what I say or falls asleep. Our seven year anniversary is coming up in february and the boy doesn't have a single romantic bone in his body, he's never offered to take me anywhere...its always me making plans and sometimes even paying. I feel like the last seven years has been a waste of time and wonder if I should kick him out or just suffer and hope he grows out of this pot smoking faze.

Any advice would be helpful :D