Help really need advice. URGENT!!!?

okay so me and my boyfriend broke up after about 2months of datin its been real hard for me and i just really need advice we havent talked in like 2 weeks till yesterday when he said hi and my name i said hi back with a wave and smile yet he didnt hear me thats what he says so now he thinks im avoiding him i feel so much regret that he didnt hear me im 14 and have school monday and just dont know what to do. helpp how do i get rid of that regret feeling