Boyfriend smoking weed

Libby
I just found out my boyfriend smoked weed over Christmas break and between the time he did it and tonight when I found out he lied to me consistently that he hasn't done it. I feel betrayed because I believed him so easily and totally trusted him. I will get over that he smoked but I don't even feel like talking to him right now. How should I go about this? I told him I'm not upset I just feel different about our relationship and I didn't reply to his last message (we do long distance he's 7 hours away.) help please!