Is it possible to never love again?

Growing up I thought I was incapable of romantic love. I've never looked at a guy and thought he was cute. I've never felt more than friendship with anyone. Except one guy. I loved him and I married him. He left years ago and I've tried to date other people. I've been to therapy and done everything I possibly can.

But I cannot form any kind of attachment to anyone else. I feel like I had my one love and it's over for me now. I could find a decent guy to be content with, but nothing is ever going to top it, so what's the point?

I can't stand the idea of living the rest of my life alone, but have no interest unless I can feel that deeply again. I don't know what else to do.