I miss my ex

It's been 3 months since me and my ex boyfriend broke up. He broke up with me. I can't get over it. Into the 2nd month I thought I was over it but I'm not. I've been crying like crazy. I want to message him but he'll just ignore it again or tell me to move on. I'm in so much pain. He was my heart my all. I did everything for him. I loved him. Can you give me tips on how to move on.