Im a dude and my best freind just tryed to kiss me (another dude)?

i was walkin home from my bus with best freind(a guy and im a guy) and he just like started kissin me and i like freeked out i pushed him on the ground and practicly ran home i dont no how to aproach him or even if i should aproach him and the weird thing is i didnt even no he was gay so is it like a sudden thing that just happened or should i just forget about him and not be freinds oh and im not gay trust me i posted another question about the girl i like just before this happen from my phone.