Is my gay best friend mean because he's gay?

my best friend and i (female) have been friends for almost a decade. in the process of our friendship we have been through a great many things, trials, first boyfriends, we share a each other's secrets. he came out about his uality around 5 years ago. we've both been through terrible breakups of longterm relationships and rely strongly on each other for support. but he isn't the same as he used to be, now he drinks and parties a lot and has a lot of friends who he calls "s" and he'd be really nice to their faces and use them but behind their backs, rip them to shreds, like right off a phone conversation with his new gay friend for a year, secretly envy him and badmouths him and puts him down in an indirect way or insinuating way, and they talk for hours upon hours each day. he also used another gay friend for rides and badmouthed him with the other friend, and stopped being friends with that one when he became "unpopular" at clubs and couldn't get him a higher social rank, he says he hates people in general and even his colleagues he goes so far as to cut them down if he sees they're succeeding over him, or is skinnier than him. he doesn't care if he's with a married "straight" man or a gay taken man who was in a relationship of over 10yrs, he got in the way of that relationship and caused mive fights between them, all of which he doesn't care abt, as long as he benefits. he is always scheming and manipulative, trying to cut down anyone in his path, and every now and then suffers from insecurities in which he calls me to boost his ego and then goes back to his old patterns. he says it's because he is gay he has to be like that, that the gay world is backstabbing and bitchy and some new young thing is always coming out and he has to be like that to come out on top so he justifies that as being mean and doesn't care whose feelings he tramples on, he doesn't believe in god and morals and wants to randomly blow men just for the sake of it so he could feel good....he never shows his true self to his anyone else except me, he lies to everyone, he even wants to out other gays without them knowing it was him, so he could enjoy their demise and he has become uncaring to even me too, he's disrespectful and downright DEMANDING sometimes and mean UNLESS some drama happens in his life in which case he needs me and relies on me, otherwise he's absorbed in his own world and if i'm unhappy abt something he hangs up the phone on me or curses me out and say hurtful things. i want to be his friend, i've always supported him but his mean ways that he justifies as being gay is ruining our friendship for over a year or two. he also is extremely obsessive and doesn't like me to have other friends, and sometimes i fear the same way he embares and blows out other friends, he'll do the same to me if i didn't hold his secrets. i don't know if this is a friendship i can salvage and i would like to know if i am being insensitive to him?