Whether you choose to move on from your struggles and enjoy life or waddle in your misery, life will continue.
Don't spend your life wondering "what if" and worrying over something you have no control. What's done is done. Looking backwards will cause you to miss out on new blessings ahead. Move on.
Instead of hating someone, pray for that person. Don't forget to pray for yourself as well, that you may learn how to let go and forgive.
It hurts to let go, to say goodbye for the final time and remain distant in your closure, it may even tear your heart out to the point of insanity; but somehow in it all you find the pieces of your worth and you start creating yourself again, and in that journey of transformation you find the essence of what truly matters, inner happiness. It's life, we all fall at some stage but it's up to you, to decide how long you want to stay there.
God will fight your battles if you just keep still. He is able to carry you through. Trust Him. Keep standing, keep believing and keep hoping.
Stay positive. Sometimes you don't even realize you're blocking your own blessings by thinking negatively and holding on to the past. Learn to let go.