I cant stop thinking about him

So i'm still crushing on this guy i like. and not just a small admiration, but a full blown love for him. the thing is, i'm never going to see him again; he's moving away. He doesn't use any type of instant messenger like kik or immesage (he uses a flip phone) so i don't know how to talk to him. I confessed, but he couldn't answer me because it was our last day together. inside, i know myself nothing will probably happen even if i could find a way to talk to him, but i want to believe. What should i do?