He started to drink... how to act?

I spent a night in the house of my boyfriend and he told me that last 3 days he was very depressed, started drinking. He showed me a half empty vodka bottle saying:look how much I drank just in 2 days. I was confused and mumbled something like:wow you better stoo drinking so much, ok. But now I really think why he did that, why showed me that bottle? he knows how anti alcohola dn anti drugs I am.
He started to drink... how to act?
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