An old friend of mine is renting his house and staying with me for a few weeks until his visa comes through which will allow him to join his wife and kids abroad. We were student friends and he's always "liked a pint" but I feel I've moved on from the big drinking days of studenthood. He bought 2 bottles of wine yesterday and opened one with his evening meal. I thought it strange that he didn't offer me a glass until he was halfway through the bottle. I declined and he said he didn't think I'd want one. He carried on drinking and to my surprise, started on the second bottle. This morning I couldn't see either bottle but found the first on the floor by the table leg. I'm now worried he's an alcoholic and even find myself speculating that his wife's thrown him out and his visa story isn't true. Am I right to be worried and should I say something?