Responses
I don't think the main couple ever outright says "I love you" but they are basically soulmates. They're constantly devoting their lives to each other, telling the other person how special they are to them, and wanting to spend their whole lives together. If you've read Asterisk, Komatta Toki Ni Wa Hoshi Ni Kike, or any CLAMP story with an ambiguous gay pairing, the main couple of Silver Diamond has a very similar vibe to those types of couples. A chill, comfortable, but deeply devoted relationship. Kinda like an old married couple.
I know it's shonen ai but are there confirmed BL romances and endgame couples?