Well by my BL reading experience, those stories that have more than one volume and started with two straight/one straight one gay from the beginning, usually have that conflict arc but will mostly if not always end up being a happy ending. I can’t remember the last time I read one where they did break up that was the ending of the story, but there are those that begin with a past of they dated someone who realized they wanted to marry a girl and have children so now they have trust issues of dating straight/bi guys, or sometimes a reencounter where the guy that was scared of commitment to a gay relationship wants a second chance.
The way I see it, their relationship may be fine now but when they become members of the society they will realize that life is not unicorns and rainbows and that the world doesn't revolve on them.. They may come into a conclusion that this might be because of the rashness of youth blah blah blah and bam break up.. I'm just realistic guys but I want to know your thoughts on this...