Lol... isn't that supposed to be done AFTER you date a person? if he rejected you right off the bat and now he's rubbing it in your face, i think thats a subconscious act of regret. childish though. I do that After... lol
If u did not rub another dude in his face... and if he did that... This guy doesn't give a flying fuck about u... and he doesn't respect u at all and thinks of u as a doormat... I would suggest u just move on. Although if u have cheated on him or he doubted that ur cheating on him... then there's nothing wrong with it.
How is he doing this? is all he's doing is just dating her?