@pinkiepops: You story is similar to mine. The tips I can give you from my personal experience:

1. You are not responsible for his happiness. It’s normal that you care about him, but his happiness is HIS responsibility. If you’re still friends you can help him and give him advice, but he’ll have to do the work.
2. By setting him free you’re actually letting him with more options to find someone that can make him happy
3. You deserve to be happy.
4. It’s painful, but he’ll get over it with time and will probably learn a precious lesson for life.
5. Life is too short to waste precious time pretending we love someone we actually don’t. We’re lying to them and to ourselves.

Big hug