Cant let go.

When I met my ex I was young and love was still full of magic and fairtale endings. I thought I had found my soul mate at our first kiss. I am older now and should know better than to believe in fairytales but I still can't seem to let go.
It is hard having a battle raging inside. My head knows all the logistics and will make great ground towards moving on and the something happens and the heart swells up and make up lost ground.
The recent milestone, I guess you can call it, is my ex is getting married. I became a mess all over again. I am having trouble figuring out if its just jealousy or if I still love him.