Help!! Anyone!!?

So! Basically. There's this guy, and I really like him. He liked me last year and I know he did cause everyone kept telling me, and he use to hit on me blah blah blah. Now that we've gone to separate schools, we don't talk at all. I gave him my number and I got his, I tried texting him once last year, but he didn't answer. I mean, we weren't that close, but I just want to talk to him and spend time with him and just be able to keep in contact with him. Now, I know what you may be thinking, "Just text him." Well, this is why I can't..

1- We're not that close

2- We don't see each other any more at all

3- We haven't talked for a long time. (1 year)

So, if he really liked me, shouldn't he put the effort in to text me? Is he over me? I don't know any more really.

And this may sound weird and stalkerish but on instagram, he always likes my photos and not other girls. Like my friend and I will post a photo and he'll like mine, but not hers.

That was irrelevant ^ but what do you guys think?

I was thinking to text him maybe saying this, "Hey, I lost all my contacts so it would be great if you could text me back telling me who you are :)"

What do you guys think? I know it may seem stupid, but this means a lot to me.