I want my heart back now...

So, he has a new girlfriend. This has hit me much harder than I expected. It hurts, it hurts a LOT. I feel like I've been replaced, upgraded for a new model. I guess I have no right to feel this way since I was the one who broke up with him. But I don't think I ever got my heart back. I feel like he had a tight hold on it and now that he's with someone else, he's forgotten that he's holding it, but it's still there. I would like it back NOW! I want to be happy, but I feel stabbed all over again. God WHY!?!?!?!?!?!? Why have I been trying to do everything right and HE has the new girlfriend, and I am still all alone? WHY is my heart hurting so much now???? God I want to be free, I want to be happy but why is it taking me so long, and him not? AGGHHHHH
Why is my chest so sore right now Father...I hurt!