Most Helpful Guy
Cut him out of your life completely. He's a shitty person, find someone who will treat you the way you deserve to be Treated.
Most Helpful Girl
don't let him bring you down... don't just make yourself look happy, make yourself realize you can be happy without him
don't worry about whether he regrets it or not... he's a douche and his opinion should no longer matter to you
it also sounds like he doesn't understand that you are no longer going out together, so whenever he comes up to sing this
this song will help him understand that you dont want to get back with him, and it's very annoying so it might get stuck in his head and torture him slowly