Yeah, everyone's forgetting that we, as the audience, can see Tsubasa's point of view, but Yuu can't. All he has been getting is that Tsubasa has been oblivious to his feelings, pseudo-rejected them, then said she liked him as a friend and a human being, and then suddenly flipped to saying she actually likes him when it seemed to her like he was acting distant. He wants her to like him, yeah, but he doesn't want her to date him out of pity or desperation, and that's what it looks like to him right now, because he doesn't have access to Tsubasa's internal train of thought like we do.