I'm Feeling Somewhat Bitter

I forgave my ex. He's completely out of my life now...unless I'm preggo - which I doubt that I am. I'm getting better, but I sometimes miss him and what we had. And I think about how he's moved on, and I hurt and feel angry and I want to wish him harm...but the "do-gooder" part of me pushes those ill thoughts of him away...usually. Tonight, I'm letting myself feel bitter. I am listening to "Fire Burns" and just like the song says, I hope his fire burns. I hope he lays down in his sleep and choke on every last lie he told, and when he's reaching out for me, I he'll see he reaped everything he sewed! 
I hope he regrets hurting me with every once of his being! I hope he regrets it and it hurts him to his core! I hope it haunts him, and I hope he comes back to me and BEGS for forgiveness. I want him to cry and hurt the way I did. And whether I take him back or not, I hope he regrets hurting me for the rest of his life!
How do you play with the heart of someone that was already broken and barely holding on? He should've left me alone from the beginning.