What to do about my crush

There is this one guy who I have been friends with since grade 3 and started to have a crush on/be best friends with in grade 6. I knew he liked me in grade 6 & 7 and the summers too. I really like him still and love talking to him but we aren't in the same classes,  but I still think about him a lot. I sent him a sort of confession of love through Instagram since that how I really started to get to know him ( we were texting and he decided to create one cause of me etc...) I don't know if he's seen it yet. Should I ask him/tell him to check or continue waiting???