I can’t move on

It has been 3 years since my ex-fiance (23F) left me(26NB). We were together almost 2 years. She was my first love and my first queer relationship. I found out today she is getting married in May and it broke me. I think I was still hoping that I would have a future with her. I truly believe she is the love of my life and I don't know how to move on. I know I have to, but I genuinely don't know how. I've dated since and been in long term relationships since, but I never loved them the way I loved her and I'm scared I will never find love like that again. What is your best advice for moving on?