I remember that line, but it could be he was just saying that - he does tell Dave later that he could never really hate anyone, and when he does meet Vriska he acts very friendly towards her, even commends her for doing such a good job at organising their battle plans. Also in the credits snaps he asks Terezi about her, if she's found her yet. So I don't think it's like he doesn't care about her anymore (not like how it feels with Karkat and Terezi