Ladies, I need your help.

I have lost the man who I thought I would one day marry. He told me that he was falling out of love with me... so I ended it. I feel like i’m dying. I can’t remember how to breathe anymore. I need your help. How do I feel better? How do I forget about him when I see him in absolutely everything? I feel like I am falling apart and I don’t want to be. What do I do? How do I walk away from someone I still love and end up in one piece?