Why has my friend changed so much?

Has your friend met some new people who mightve influenced him? Or maybe hes been rejected by a girl or secretly likes someone that he knows he cant have. Also he might be having family problems, like girls guys cant cope with feelings and emotions professionally they prefer downing their sorrows with a bottle of vodka. I know its hard for you but try to find out whats getting him to act like this. Dont be too forceful though like an adult, he needs a friend not another adult maybe telling him what hes doing is wrong. X