So, I'm looking for some yaoi mangas where seme often cheats on uke but they're still together or they'd broke up and eventually end up together again ^^

It may be something like a third couple from Scarlet by Madarame Hiro (Keito/Naoki)

Overdose maybe..

yesterday i read this...

Ubawareru Koto Marugoto Zenbu

it's funny and smutty.. i hope is what you're looking for 🙂

(=ヮ=)೨

Kyuuso wa Cheese no Yume o Miru and its sequel has a whole lot of cheating.

Thanks for replies! I personally really like Kyuuso wa Cheese no Yume o Miru but Ubawareru Koto Marugoto Zenbu is totally nice one >.< and Overdose ,really my thanks for this one 🙂

I would recommend:
Overdose (like everyone else)
Kyuuso wa Cheese no Yume o Miru and the sequel (also recommend by everyone else 'cause it's so damn good!)
Aishuu? Kinda cheating...in a sense...it's still good tho

😔 sadly i can't think of any more...and i'm sure there's more cheating semes out there.

how can I forgot about Aishuu ~~ Thanks thanks, he sure was cheating 😀

Yachin Hanbun no Ibasho desu, story 6

Not/Love and related stories about Bun and Daisuke by MIYAMOTO Kano, though it's not so much that Daisuke cheats on Bun, but rather Bun is the 'other woman'.

I just read Tsugou no Ii Kimi, in which the seme cheats with women, but I can't recommend it unless you really want this type of story. The characters' actions made no sense, the uke was ugly, and the scanlation made an already confusing story nearly incomprehensible.

Sorry, can't think of anything else.

Isn't the one doing the cheating in Ubawareru Koto Marugoto Zenbu the uke?