Blindsided by breakup - 3 days ago. What do I do?

How do I move on from a relationship that was picture perfect? We had healthy communication, we were so in love. He still loves me. I can’t picture being with anyone else. It was that best friend kind of love. He sprung it on me that he didn’t see a future with me anymore and felt stuck.

I can’t eat, I can’t stop crying. How do I do this? He’s the only one I could ever picture having for the rest of my life. I’m terrified of life without him.