Megatron gives him a Look at that codependency remark; he doesn't honour it with an actual reply, perhaps because it is, like, 100% accurate and true.

"... Perhaps it would have," he says, and he sounds profoundly regretful – because he can believe well enough that it might have done, because he can remember all too well how his next assault on Cybertron had been, to some extent, simply going through the motions, because that was what he did; because he's ashamed that he was so deeply entrenched that he needed someone to tell him what he was doing to be able to actually stop.