Me and my boyfrend, we have been going out for more than a year. And I always suspected that he smokes weed. And recently I found out some stuff in his ashtray and I told him that I know he is smoking weed and I showed him proof. But he said its not his and that its his cousine's and a frend's. So I called them up, and his cousine said its none of my business and his friend said that it was his stuff, not my boyfreind's.
I want to know if he is smoking weed. I want to find out. But how can I tell?