I am completely anti drug, but my boyfriend is a daily user. He's a nice guy overall.Should I breakup?

We have been dating for over a year. We have alot of fun and have alot in common. He is faithful, very caring and supportive of me. We hardly ever argue. Out of all the men, I've dated, he's the only one that I truly felt was a real BOYFRIEND. He is like a kid in a lot of ways, but is basically responsible. He recently brought up being engaged. And I don't feel that he would be good husband material because of his drug usage.

I just feel that his usage is going to cause alot of issues in regards to judgement and his overall mental health, which will affect the relationship and my being able to count on him if we were to get married.