Oh I just don't believe that you have got it in you cause
Calum refused to see the other side, to hear the story from Michaels perspective. He was too selfish to understand because the only thing he wanted was Michael. He spent months trying to make him his just to be replaced in a split second.
He tried not to believe it, tried to tell himself that Michael could come crawling back to him. Tried to convince himself that he'd be nothing without Calum's kisses or cuddles or hugs, but he was wrong.
Michael didn't need any of that.