Any suggestions for moving on?

Throughout college I was on and off again with this guy even when we were off and “seeing” other people he was always on my mind.
Constantly. Whenever I thought about the future my thoughts went straight to him. He always said as soon as college was done we would work things out and be together. Funny thing is, hours after his graduation he made the decision to “just be friends.” I was crushed, I couldn’t and still don’t understand why after everything and me waiting, that this is all it would end up to be. He was one of the closest people to me so it’s hard to just let go. He still talks to me everyday but it’s so hard. It’s like he is totally okay with just being friends but I am having a really hard time. I want to be able to be his friend but I’m so hurt that someone I fell in love with, just wants to be friends. How do I get over this?