Most Helpful Guy
To be honest it's not a rare case, i'm sorry you feel hurt. But look at it this way, maybe it's just a rebound girl. OR If he's been seeing her whilst you two were dating then you just dodged a bullet. That guy's not a keeper.
I know it still hurts though. Hang tough, okay.
Most Helpful Girl
It could be she Already knew this dude before Your... Breakup.
It is something to Consider, For it does seem rather Strange that after Much His and Her history, She would 'Immediately hook up with someone'...
No matter what, I Feel any Deal right now is just a Rebound she has Found.
Good luck. xx