I'm a sucker for unrequited love stories.

Looking for a yaoi/ shounen-ai manga where a main character (preferably the seme), was, or is married, or at least in a long-time relationship, and the other guy has been pining after him all of this time. The ideal situation I'm after is that they have been friends for ages, both realise they're in love with each other, and things go from there.

Two I've read which have plotlines like this are Ashita mo Tanin and Cherry (ICHIJOU Lemon) , where the 'friend' has been pining for the other guy for ages, but couldn't do anything because he was married.

Barring that, yuri/shoujo-ai equivalents to this are totally fine to.

thanks.

The Cornered Mouse Dreams of Cheese? (Drama warning. loooool)

Hand Which - I don't remember if the main character Sawazu was ever married, but it might be worthwhile if you give it a chance.

Ai no Gebokutachi

Sumanai!! Masumi-kun kinda fits.

I second The Cornered Mouse Dreams of Cheese, it's awesome. (and it has a sequel The Carp on the Chopping Block Jumps Twice)

Bokura wa Tada Hashiru Dake by Yamada Yugi
maybe Close the Last Door, too, also by Yamada Yugi. Main chara has a crush on his kouhai for years now and this kohai gets married at the beginning of the story. He doesn't end up with this crush of his, though.
Open Air by Tsunoda Ryoku. Then again, the main chara (seme) doesn't end up with his married crush.

thanks for the recs, will go through them, some are new to me. 🙂
Not that more wouldn't be welcome though! 🙂

I've got one!

Sorenari ni Shinkan nandesu [url=http://www.mangaupdates.com/series.html?id=43018[/url]] by Asou Kai

still... might qualify, although:

it has a rather open-ended ending and it's the uke that married

http://www.mangaupdates.com/series.html?id=2590

Takaga Koi daro, another by Yamada Yugi. The uke was married; his brother-in-law is the third man out.