How do I move on?

I literally had a crush on this guy for almost 10 years and he never knew I existed. Until one day we started talking and than hanging out and the started a relationship. Now we’re in a bad place been fighting a lot and know we are over. We break up a lot and get back together but I really think it’s over this time. He told me he has no romantic feelings for me. It’s over and I don’t know how I will ever move on. I’ve liked him for so long and than I actually started to date him which I thought would never ever happen and now it’s just done.