Ugg boy troubles, please help!?

okay so this guy made i very obvious that he was into me, by always looking my way and high fiving me in gym. and hes iight so i decided to go for it and as i was about to talk to him my best friend who is a guy came in and started talking to me. idk but i think this dood thinks my bff is my boyfriend cause hes been acting all weird ever since. i dont really know what to do anymore. should i like add him on fb or something? please help!