I am so sorry for your pain. It does take time to heal and its important to allow yourself to breath and remember the things in life to be grateful for.
One thing might be to focus on what you are trying to achieve. I surmise that you would not want H back because he has a new baby? Figure it out. What do you want? Focus.
It may be that all you want is to get through this pain. Then its step by step. Recognize every small triumph of happiness you achieve. Try to remember yourself as happy and then recreate yourself through happiness. Focus on achieving a state of happiness, moment by moment. I've done this. It works.
