It doesn't have a little different scenario, but seems like one of the Kuroneko series. I'm very sorry but I don't remember which Kuroneko book it was. I hope it helped a little.
does* have a little different scenario
Pretty sure it is the Kuroneko series - in one of the later iterations - just before the Hollywood trip - cannot rember which chapter though. http://www.mangago.me/read-manga/kuroneko_kareshi_no_amaekata/
I just suddenly remember this certain YAOI Manga... Well, I dont really remember the exact plot all I could tell is that, (this is just a part of the story actually), which is the seme and uke (they are couple)was having a dinner(?) Then, all of sudden the uke said he wants to break up because of "some reason". The seme was badly hurt so he left the scene but he also left the supposed "gift" that he wanted to give and when the uke opened it... it has a ring inside.
-- that is all folks (lol), I am not entirely sure if I got it correct but please if you happen to know the Manga, let me know!(/TДT)/
Edit: I am not also sure if all of it's chapters was translated already but still... ┗( T﹏T )┛