I was a little confused here as well. I think YuYang was trying to avoid separating himself and Lihuan by saying "you won't understand me because we're different." I don't think that was a bad thing to say though so I could have missed what the author way trying yo convey there.
i think that he was trying not to say that he like LiHuan b/c he was afaid of being rejected by him like that lin xiang(i think), the dude dating the blonde.
Same thing we were discussing in this topic, Carol: http://www.mangago.zone/home/mangatopic/3481414/
What was that repeated phrase about? What really was YuYang trying to not say or did he say... I thought when I first read it was LiHuan trying to figure out if it was time for him to confess but it is shown in frames with YuYang so it must be his thought... I don't get this, even after 3-4 re-reads at this point!