Whatever you said, it's not temporary. She's been remembering all day and it hasn't changed anything. She still thinks you won't hurt her and that you want her to be happy. Which doesn't help because I think she's remembered more and making sense of you here and you there sent her outside. [ Maybe to break apart. ] What, exactly, did you say Katherine?

[ Damon's tone has calmed, exasperation giving way to needing to know what's going on. If Katherine didn't want Elena to break apart, that meant Katherine (or a part of Katherine) cares what happens to Elena, and if anything that's happened here benefits him and Stefan and Caroline the most, her newfound love for her sister Elena ranks up there.

Even if Katherine believes it will be temporary, he knows compulsion isn't - not when things aren't specified. It's like being careful what she should wish for. She wanted her to not break apart, and in turn, she received a loving sister now confused about things she very much remembers. Things, that tonight, are Damon's fault. ]