Back to December

There was a girl who met a guy at her favorite place. They get along together and unexpectedly fell in love with each other. But, the girl had to leave him coz she thinks it's complicated but then she realized it's not and she could not bare a thought of losing him again. But the question is,
does the guy still loves her or he had already somebody else ? Is it too late for them or it will turn out to be a happily ever after ?