Cheating is no option what so ever!! Do that seme
I've read the raws and yes he is a Cheater!!! He is clearly in a relationship with SAWA-SAN and the uke is the THIRD PARTY. Uke is already hinted by Sawa-san that they are IN A RELATIONSHIP. But the guys of Uke and Seme to say they are inlove with each other after Sawa-san and Seme came back from a hot spring vacation.
I just hope Seme will not do the same thing he did to Sawa-san to his Uke now.
And I'm happy that Sawa-san found someone who is LOYAL and not a Cheater and unlike the Seme here Sawa-san waited for his Seme to come back to him even after 3 long yrs!!!
I agree with ur opinions, he really adored this cute couple but after figure out the dots that he was Sawa Reiji ex, a huge stone crushed on me. I even needed to add a comment here on this manga myself, since I felt so frustrated... Since I really loved them but now I can’t love this couple as much as before... Σ(  ̄□ ̄||)
Could you just leave this story alone until it's complete?
It's really bad, that the translation of the sequel overrode the translation of the first story.
You supposed to read it in the right order, to really understand what's going on.
The sequel is Reiji's story, so it is really biased, if you think of his role here. You need to know what happened in this story before you can judge any of the characters.