He is an admitted pot smoker, but for the last 6-8 months his behavior has gotten erratic. We live in different towns and used to spend whole weekends together but he resists that now. Says he can't sleep, doesn't eat early in the day at all, binges on candy, sex drive declined ... calls come in that he doesn't want to answer in front of me. Groups of friends I am excluded from hanging with ... I thought initially he was cheating but the swings in mood and up and down behavior makes me think drugs. I don't use drugs of any sort so I don't have any idea what to look for.