How do I tell him that I like him?

[Ok...]

You DONT tell a guy you like him... you let HIM tell YOU.

In other words, if a guy's not telling you he likes you, if he's meh in convos like you say he is, if he's not PURSUING you, if he's not making it KNOWN to you.... then babe....

He is NOT into you.

There are billions of other guys on this planet. Dont get hung up on ONE guy, and the ONE guy that doesnt even want to talk to you. Also, you are insulting the great guys that have been waiting for you to notice them... because you have been waaay too hung up on this ONE dude, that's probably only into Asian girls only. See? (p.s. you can switch the word asian to any other adjective you like; just dont lose the point. And the point is, he is into whatever it is, or whoever it is... it just happens to be anything but you. Not trying to sound mean here, but trying to tell you how guys think. Dont pine away for someone you wont ever be with. Good luck.