I agree prayers and duas to get the love out of your hearts is the best option as well as everything else GG suggested.
Important to mention it was an emotional relationship based on love rather than superficial. True love is hard to get over and would be for him also. He wants you to move on and get married also yet expecting him to get married as well might not work out. Don’t tie your fortunes to what he does. What if he never marries? what if his system never gets back to normal? What if he is never truly happy with someone else..and never finds someone who cares for him? What if he does marry just so you marry but does not feel happy?
You can’t hold yourself responsible for all what happens to him. You have to consider yourself first as selfish as it sounds. I agree God does what is best for all of us.