Responses
I'don't rem thoes kind of manga right now but!
If you want to read where the seme feel "guilty" and hurt because of it then i can recommend two for now:
http://www.mangago.me/read-manga/overdose/
http://www.mangago.me/read-manga/aishuu/
Totally captivated
Some yaoi manga where seme or uke DOESN'T forgive the cheating? I'm fed up with forgiving guys... -.- it's making me angry all the time to see cheaters getting away with it just with a warning -.-