Most Helpful Guy
Start by changing up what you are doing. Take some time off from relationships and let yourself mourn the loss of it. Remove him from all social media and don't check up on him. Take some time for you to figure out what you need and want. Do some things you have wanted to do and hang out with your friends. Before you know it you will all but never think about him and he will be just a part of your past. Then you will be OK to put yourself back out there again when you are ready.
Do not contact him or hang yourself up on it. Its over and he wanted something else is all. Remember most relationships fail.