I have a friend who I met through work years ago. When I met him he described himself as bi. I accepted that and didn't think anything of it at first. Over time I he slowly confided in me that he was more gay than bi. I told him I wasn't surprised. We discussed his parents and friends and who would accept him and who wouldn't. I told him friends that didn't support him weren't friends. His parents were a tougher issue. Once he came out to everyone he actually thanked me for his support and said he couldn't have done it with out me.
Maybe talk to the guy that is happily attached to his guy friend. He might be able to give you the support you need.
'People are never perfect but love can be. People waste time looking for the perfect lover rather than creating the perfect love' - Princess Leigh-Cheri from Still Life With Woodpecker.