Responses
It kind of sounds like the last chapter in this but I could be wrong.
http://www.mangago.me/read-manga/yachin_hanbun_no_ibasho_desu/
beta
the seme is often hand in hand with other guys. Because every time his uke finds out and cries, the seme sees his uke's crying face cute. And one day the uke is so angry and decides to do the same way the seme did. After that the seme regrets it and they are back to lovey-dovey.
One thing I can remember is that one of the seme's friends say that they are the couple with longest relatioships he ever know.
Thank you very much!!!!