When my bestfriend confess to me that he's gay..it seems there's a wall between us now..?

were both 16 and member of our school basketball varsity team..were best friends since our diaper day but few days ago he said he's gay..im confused and got mad at him never talk to him..most of the reader here advise me to talk to him so i did..he said if i tell anyone about him being gay he will shoot himself..gee! i freak out, his dad is an officer in military so the gay thing is taboo. yesterday we have practice and i got very hard on him, foul him hard and he falls down realy hard. usually if he falls down during games i pulled him up this time i let him down the floor and kick his shoes hard while ping him..our coach noticed that were not thesame so he called me up and ask me if we quarreled i said no.but he didnt believe me..honestly seems we are n ot thesame as before, usually we joked around of many things about girls, , masturbation.. i can hold him anywhere, do hi 5's, or bump our chest or slap our s if we do good in the court, get naked in the shower and fool around...now its quite different, he's gay and the things we do before is no longer applicable..geee..please help me what to do..or what will i do to get rid of my bad attitudes towards gay..but im not phobic...i just like my best friend to be straight guy same as i do..thanks