Can a gay person be christian?

Well i have a friend (yes a friend) his names caelan but hes a STRONG extremely strong christian, but i have a feeling hes "gay" he just acts like it... the way he talks! the words he uses and he doesn't even act like he likes any girls! but i asked a priest and he said "well if hes gay hes breaking a extremely big sin being gay is like suicide you become it than your going to hell its something you Can NOT repent from" but still i feel bad for him :(