this isn't the one you are looking for but i just wanted to throw this out there, since it's almost the same storyline (i love it so muchh)~ http://www.mangago.me/read-manga/sawattemo_ii_kana/ ヾ(❀╹◡╹)ノ~
It doesn't sound like this one but I'll just leave this here http://www.mangago.me/read-manga/sayonara_note/
I can't read Chinese so I can't tell you what they are saying but here are the raws http://www.77mh.com/colist_187402.html
Hi, just wanna find a yaoi manga
Plot : Seme and uke is a childhood friend, actually Seme liked uke , and they went to high school / college together, and when the Seme wanna confess it seems that the uke had a gf and the gf is theirs friends, thus, the Seme went abroad the uke and his gf sent him off from the airport, (I think the uke like the Seme , just worried that the Seme futures might ruined that so he comes up with a which is uke got a gf) , and also the manga is on going and I need help pls help me (/TДT)/