So theres this boy

So theres this boy who ive liked on and off since the end of grade 9, its now the beginning of grade 11, at the beginning of grade 10 i liked him but i thought he didnt like me and he felt the same way, but i just found out this past summer. We have had moments before that seems that he liked me but not in a while, ive never had a boyfriend and i rly like him, should i do something or just leave it?