
ummm but Yuu is not actually against their friendship he is only jealous and not in an overdramatic way but in the I'm gone cooly expresses it openly way...he didn't try to stop her when the three of them were in a group, neither did he pressure Tsubasa to not take the student council position.
for Yuu he knows how dense Tsubasa is toward his feeling so he expresses his feelings openly to her... also its the comical aspect of their friendships ... that is supposed to show the advantage of friends being lovers... they have always openly expressed their interest and dislikes about everything to one another.... and also if he was actually jealous he wouldn't have expressed it so outwardly especially not when the guy he is jealous of is there and he tells him he doesn't like him in his face.
Yuu even at times says how he doesn't like the senpai around Tendou when the guy she has a crush is around because he knows what everyone romanticly feels for another and doesn't want unwanted misunderstandings to come out of situations.
Yuu's and Tendou's friendship is just natural... as I said before, it can't even really be called a friendship because neither of them wants any part in it... the main reason he hangs out with Tendou is because of Tsubasa and Yuu just happened to pop up at times and locations that Tendou happened to be at so life really bought them together and allowed them to develop their unspoken friendship together.
Tsubasa also knows in her jealousy towards Yuu's and Tendou's friendship that there is nothing going on between them it's just that she needed to see Yuu close to someone else for her to realize what jealousy was and for her to understand that its natural to feel that way.
I asked the person to get out of this post because their point is really invalid ... and sadly quite fickle and pointless (in the most polite way) -.-
so I don't even know why this needs to be discussed.

Jodes711 - she didn't abuse him but she has already used him to make Tachinbana what you would call "jealous."
She "used him" when she pulled his hand and it wasn't much of I'm gone make you jealous but rather it was her statement toward Tachinbana that he didn't need to walk on eggshell around her and that she has the power/ can move on from her unrequested love towards him.
Yuu can have an opinion about all of Tsubasa's relationships not just because he is her BF but also because he is her childhood friend and the one who knows her at times better than herself.
That's just the nature of their relationship however Yuu never actually gets in between their relationship so I don't understand why you keep suggesting that Yuu gets involved... if you think he is involved now wait for the next few chapters.
Umm is it weird that the more I read/ re-read/ think about the characters the more I like certain relationships?
Like for me I’m all about Tendou and Yuu’s underrated friendship?
I already knew how significant Yuu’s presence was for Tendou but now I also think tendou’s character has had huge influence on Yuu’s character.