Why would a gay/bisexual man be after my sister?

for years he was telling her she wasn't his type & now he has came out for sure how he's into men. but she was never checking for him. She completely forgot about him through the years.

Why is he going out of his way to make it known to her of these things when she never asked for it?

Why would a gay/bisexual man be after my sister?
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