When a guy offers to buy you a drink, what does that usually mean?

Anonymous
I met my friend's brother a few weeks ago at a city festival that we all went to. Anyways, this past weekend we were at a party and he kept asking only me even when I was with my other friends if I wanted a drink because he would buy it for me..So yeah, what does that mean?
When a guy offers to buy you a drink, what does that usually mean?
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