How to get over my ex

Me and my BF have been dating for a year and we decided to break things up and move on, but i am unable to do so because i love him very much. I don’t think i can ever get a guy like him who understands me, who doesn’t take advantage of my dumbness, who really cares for me still, we had a lot of happy moments together. First time ever i felt loved. My inner child was happy i met him. I really know that he loves me so much, but circumstances are very bad that we had to split. How do i move on from a person who means the world to you? Does this ever go away in a few months or years? I feel like i can never really fill this void he left behind. Nobody can ig.