When talking about Yuu's view of love and how it negatively impacts her; I think it's worth noting that a lot of the pain she feels is because she has ONE idea of what love is. It's the one, completely necessary, doki doki, heart throb feeling. She doesn't yet understand that there are, like you said, infinite aspects to love.I like how you pointed out that Touko is experiencing that kind of love for Yuu, a bit of an unfortunate reinforcement of Yuu's narrow view of love.