i am at a crossroads

my best friend has been involved with this guy for the past couple of months (they are a gay couple btw). i was super happy for him! we have been close like family for nearly 10 years. i only want for his happiness and he's waited to be in love for years now.

i have a problem with their relationship though. they have already been in about 5 big quarrels. they have all revolved around the same issue: his boyfriend's drinking. this last week they got into a screaming match because boyfriend got wasted and saw my best friend just talking to this group of guys... that the bartender introduced him to. instead of approaching my best friend and the group he stays away, watches, and stews. he became enraged with jealousy which led to a big fight all the way back to my best friend's place. it was during this time that the boyfriend admitted that he was an alcoholic.

this guy also has major jealousy issues. i've always gotten the feeling from him that he is even jealous of the relationship that i have with my best friend. jealous of the extreme closeness and love between us. he acts really weird when i am around and even treats my best friend differently when i'm there. it's not like he'd have anything to worry about. i am a girl, he is a gay guy, and it would be like incest anyway. ew! i think he doesn't like that i interfere with any time that could be given to him. note: this (25 y.o.) kid is a spoiled brat whose dad is rich. this is the 3rd time his father has sent him to college. he gets to live like a career student and my best friend actually pays to wine and dine him too.

now i am understanding to the guy's condition. i don't think less of him for it. he deserves love like everyone else. however, i am still wanting what is best for my friend. i suppose i fear he is treading in territory he is not equipped to deal with. i appreciate his persistence to help boyfriend, and respect his decision to stick it out, but it's like i can already see the outcome. he knows i support him even if i don't agree but i am greatly disheartened that he won't take off the rose-colored glasses. i see my friend give of himself, his time, energy, and money and he barely receives a "thank you" from the guy. it's like the guy just expects it because he's used to it. i don't dislike the guy but i always see my friend give way more of himself to these men who don't reciprocate far too often.