if didn’t end up with daego why put him on the cover

Because Daigo is his first crush. How many of end up with our first/school crushes?

Ok but a lot of besty bestfriend really act like that so its not gonna be surprised if they end up not together as this manga's is more on realistic side and realistically speaking, bestfriends do be acting like that so yeahhhh

I think the author already stated that Daego isn't the endgame, because Hiroki is partly based on himself (and the kind of mom/parents) he wishes for.

The gay coworker is a self-insert and draws strong parallel to Hiroki's future.