What should I do now?

Its hard, its really hard. I miss him like crazy. I check his pics on social networks, even though we are no longer friends on any. I think he has moved on, and it even hurts the more. I’ve seen him a couple of times, but we always fought on those occasions. I was told I would feel beta with time, but its almost 5 months and I’m still hurt, like really hurt. I can’t even really go on dates with guys because all I think about is him. Sometimes, when I see a guy, I think its him. I’m always remembering him in almost everything I do or my friends do. What should I do? I know its really unreasonable but I can’t help it.