Optimus doesn't know how to feel about this either, but it is at least a far less blatantly tsundere reaction. Instead, his optics just linger on Starscream for a few moments, judging his sincerity. It doesn't seem the same as his obvious attempts at sychophancy.

"There is no need for further pain to result from all of this," he says tiredly, and turns to leave. That is quite enough of this for now. "Goodbye, Starscream."

He is so out of here.