What makes a guy care for a girl he barely knows?

She’s not a stranger but he shows her signs of caring… as teens and he pops up on her people you may know out of no where

he was always kind to her and paid attention to her when no else did. She was a loser and not very smart.. girls were always mean

he did call her pretty once

he changed the page of her book for her when she was on the wrong page

he listened when no one else was listening to me

What makes a guy care for a girl he barely knows?
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