How long?

Sw

How long does it takes to move on and get over your first love? I know it might sound like a stupid question but I'm really concerned.. I honestly don't know why I'm finding it so hard to move on. He was my first and was together for 8 years, been broken up for 2 years now.. is it normal? He on the other hand had been move on a long time ago but I don't know why I'm still holding onto something that's not there no more..do I need help? I'm really becoming worry about myself..