I am over my ex, but I'm hurt knowing that he's moving on?

It's normal to feel that way, he in a way was yours, and it hurts even worse when that person can't take it in a mature way and has to do spiteful things to get at you. I totally understand, my ex did this, and that feeling where you just feel cheated and feel it's injustice is normal. who is he to talk to that girl who caused you strife? who does he think he is? how could he do that to you? well, obviously he couldn't have cared for you that much if he can't let you go to be happy somewhere else and has nasty words for you. it might be hard but you have to ignore him, and know that you will be in a better place soon enough and that if his attitude persists he will be with people he deserves to be with. Take the high road and leave him in the dust.