Why isn't this guy reaching out to me?

Guy (X) is a mutual friend, and we will meet whenever we go out for drinks, although not together. Initially, it started off with compliments and buying drinks, but the last time I met him, he actually asked me out on a date the next day. However, he has no way of contacting me because he never asked for my number or even my Instagram. His good friend used to talk to me on Instagram, so is it safe to assume that he knows my Instagram, but just doesn't want to approach me?

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+1 y
We only meet when I go for drinks (he goes there very often, and I go there once in a while), so we don't get to meet all the time as well.
Why isn't this guy reaching out to me?
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