"I did, I do." He can't possibly believe that it doesn't deserve an apology, though, not after how upset the two of them had gotten. "But I had said it even after you said that you didn't want to leave me here alone. I wasn't trying to disregard what you wanted, or anything, just..."

Just what? He hesitates for a moment, and continues a bit quieter,

"I can't help but feel like you would both feel better if you had gone with him."

There wouldn't have been those teary eyes from her, probably. There would have been a person to help keep Kai company, and not just those inert robots.