<human>: Can you give me the gist of the text in a nutshell?

Hi reddit, 

I'm having an issue with one of my good friends that I've known for a long time, initially through a capella friends. He's proposing to his girlfriend next week. The thing is, I really -- really -- think he's closeted and may be making a mistake. This is not an issue we have ever addressed directly. 

I'm not doing this based on stereotypes, but based on the fact that he's my close friend and he seems genuinely disinterested in marrying this woman. And also, agh, he just seems so gay. He's international and from a more conservative culture that is far less open (/it can be dangerous) to admit homosexuality. 

Here are some items:
when talking about marriage for love: "the marriage thing is not based on love" (but that it's not a green card thing)
does not claim to be in love with his girlfriend, but describes marriage as the next practical step / sees no other alternative to marrying her. 
discussed wanting to have a threesome with a guy

He..
tap dances
sings opera
sings jazz
sings a capella
does leather works
buys 400 dollar shoes with flowers on them
watches rupaul religiously
just turned him on to jane the virgin
buys socks in the "color of the year" as defined by vogue, or something
little to no male friends and doesn't understand why
sings cher wherever we go
listens to musicals all day

Do I bring this up at all? Take him out for wine and have a heart to heart?
Or just leave him to his thing?
<bot>: friend seems gay. or at least pretty disinterested in marrying his girlfriend, but is going to propose anyway. do anything? do nothing?