How could I talk to this guy? Would it be weird if I added him on Facebook?

[Tianda]

I used to like this guy a lot a few years ago and he used to like me too but he graduated and went to a different highschool as I do now.. I never really stopped liking him but it was hard to keep up strong feelings when i stopped being able to see him and talk to him. A few weeks ago i saw him while walking to my friend's house and he kept staring at me. Lately I've been thinking about us when we were younger and I think I started thinking about him and liking him more. I used to have him as friend on Facebook but he cleaned out his list and deleted me along with many other people. Would it be weird if I added him on Facebook again? I want to start talking to him again but I don't know if he'd think I'm creepy or annoying. I also don't know if he likes someone else or not. Any advice?