How do I get over the most important person in my life?

I was with my ex for 61/2 years, I went to NZ for a holiday and he ignored me while i was there when i got back he kept ignorning me then a few days later i receive an email from him breaking up with me saying he needs to find himself and that hes going to nepal for a month. Our relatinship was long distance he meant everything to me and kept saying how excited he was to come and live with me when he got out of the military its like his feelings all changed overnight, 2 months earlier he was planning on proposing to me in Hawaii! I suspect he broke it off cuz he didnt want to move to where i live to be with me and i know he still loves me we were so close but he has cut off all contact with me since the email, he ignores my calls etc deep down i keep thinking one day he will change his mind and regret it i can't get over him i compare every guy to him and the min i try to move on i freak out. I and many other ppl don't believe his story about going to nepal. i just dont know what 2 do