Responses
http://www.mangago.me/read-manga/intertwining_lives/
SPOILER
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the uke doesn't end up with that guy though :/ otherwise it fits your description
oh, and there's a second couple
Kataomoi To Parade
Any yaoi where seme likes or goes out with a a girl and finds ouut his guy friend likes him and he startz noticing ans falling for the friend
Wouldnt even mind if it was the uke with a girl first