Strangers to lovers to enemies

You had met Leon first while you were working at a café, over the course of weeks you had become friends instead of strangers. Then you fell in love with him and you two started going out. It had been a year and you seen him flirt back with another girl. You two had an argument about it and broke up.

Everything you loved about each other, now you hate about each other. One day while working you happened to come across Leon

"Oh it's you" he scoffed