what does it mean when a guy comments “💯” on a girls post?

my boyfriend commented “💯💯” on two girls posts.

one of the girls i fought back in high school and she has a bf. the bf commented on his comment saying “do you need some water” then he dmed me on ig saying “im sorry you have to deal with a guy who comments on other womens photos. arent you his girlfriend? best of luck”

when i asked my bf about it he said it doesnt mean anything. but they’re selfies so idk what he’s trying to say.

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