What would happen if you just accept that you feel love for him, AND that the relationship has run its course? Can you find peace in acknowledging both sides simultaneously? When I discovered this and used it in my own life, it brought great relief to accept that just because the relationship was over didn't necessarily mean I had to let go of my love for him. So whenever I thought of him, instead of feeling bad, I would just mentally send him love, wish him well, and let it go.
Stop checking up on him.
Whether you are doing a drive-by, checking out his Facebook profile, or asking friends about him, this sort of activity is robbing you of your own healing. After all, you cannot be moving your life forward when you are spending your time obsessing over how he is spending his.
Even if you parted on good terms, it's time to Unfriend him on Facebook, take a different route home (one that doesn't go those special places), and pre-plan new topics to chat about when you meet old mutual friends.
Bring in clarity.
Life is a series of stepping stones, and hopefully you are using them to move you upwards. How can this relationship be a stepping stone towards something even better, greater, and more intimate, etc.? What did you learn from this past relationship?
Right after my divorce, I made a list of all the qualities I wanted in my next relationship. Within just two months, I had met someone that nailed all of those qualities. We had a fabulous relationship, but it lacked certain other characteristics that would make it sustainable. What I gained was enormous clarity, so I continued to add to the list. Don't leave your life up to chance, grab your journal and make your crystal clear list.