Has weed changed him beyond repair?

Let him know that weed depletes (takes away) nutrition and certain nutritional deficiencies can have a major effect on the person's health later on. I personally wouldn't keep dating him. If he says that he would break up with you if he could only take weed less than twice a week... wow that says it all. he's not worth it. If I were you (just my suggestion) I would say "either the weed is gotta go, or I'm going" and go from there. Maybe some day he will mature up and wished he hadn't lost you.