It's really noticeable how they're both thinking about the other when it comes to these concerns - You Yu wanting to support Chi Tang both now and in the future, and Chi Tang worrying about the pressure You Yu is putting herself under . . .
I get the feeling Chi Tang would feel a little scandalised if she knew that You Yu wasn't thinking about anyone but her - Chi Tang certainly doesn't consider herself important enough for that, and You Yu is far too important in her mind to be wasting so much of her time on someone so insignificant. At the same time, though, I think Chi Tang is just a little bit chuffed that they're so close, and that their dorm mates (and friends!) see them as special to each other. I mean, it's embarrassing for her, but at the same time it clearly gives Chi Tang a warm fuzzy feeling.
Whereas You Yu is waaay past the point of no return . . . Still plenty of warm fuzzies for her, of course, but she's getting further and further into the "Oh my god she's so beautiful I just want to kiss her" stage of falling in love. Though I'm far from certain that she'll actually kiss Chi Tang, at least not for a long while yet . . .