My crush doesn't like me anymore. how do I get him to like me again?

My crush used to like me but i didn't realise at that time. He used to stare at me all the time. My friend said he was always talking about me and stuck up for me. He would talk about me to his friends. How do i get him to like me again?
My crush doesn't like me anymore. how do I get him to like me again?
Post Opinion