What do i say to him?

[Vic]

You can keep flirting with him and see if he responds back proportionally. You need to coax him out of hiding and to ask you out.

If he still doesn't break, you can tell him you like him indirectly, mabye by giving him a Christmas present or B-day present. That should be a clear sign.

If he doesn't get it by then, you will have to do the last resort and actually tell him you like him.