Is NOBODY wrong in the post ? POST : I had a mild hook up with a girl I work with a year ago. Afterwards I suggested trying to start a relationship, but she turned it down saying the reason is she doesn’t want to be with someone she works with. Life went on, we’re pretty good friends, but I still have a slight romantic interest. 

Fast forward to now, we went out for happy hour with colleagues, she was flirty with a coworker and went home with him. I’m guessing they hooked up, but I could be wrong. 

AITA for being hurt and annoyed by this?