I'm actually quite hopeful that things will end up well between Yuu and Touko - it's the part where Touko says, even if everything else about herself was fake, her love for Yuu is her own that makes me hopeful. Combined with all the imagery of Yuu holding her hand and taking the lead, I'm really hoping that it means Touko's love for Yuu and Yuu's efforts to help her will lead to Touko "finding herself" and accepting Yuu's love for her too.
The very last part about how this can't go on forever did throw me off a bit but it arguably could still go both ways. There would have to be a change if Touko learns to accept herself, but it could be a good change. I feel like Yuu is underestimating the strength of Touko's feelings for her vis-a-vis Touko's sense of self-identity, especially since Touko has recognised that these feelings are entirely her own.
And so, I hope.