Touko has explicitly said, even in recent chapters, that she is in love with Yuu.
Touko’s love for Yuu is sort of the black box of the entire series—its origin is mysterious, or at least highly unusual, and a central dynamic of the story is that the love has been interdicted from being reciprocal—Yuu has essentially been forbidden to be in love with Touko, and Yuu has explicitly promised that she would not fall in love with Touko.
But we know that Yuu has broken that promise. (It was a crappy thing to make someone promise anyway, and Touko is damn lucky that Yuu has broken it.)
So what happens to that love after Touko’s change of attitude about herself? I’ve resisted the temptation to put ‘love’ in quotation marks, because Touko’s feelings for Yuu have always seemed to be quite sincere. To suddenly drop everything now would diminish the whole previous story, making the relationship between the two main characters into a hollow simulation, a mere crutch to prop up Touko’s dysfunctional psychology that can now be discarded.
Touko has taken her relationships with both Yuu and Sayaka quite seriously; I just don’t see her suddenly giving Yuu her walking papers and Sayaka a free ticket out of the friend zone because she now feels better about herself.
But what now happens to that romantic attraction when she discovers that Yuu returns it remains the primary mystery of that black box.