This is how Optimus expresses his concerns goes in Princess Twilight Sparkle.

[Optimus walks over to Twilight]

Optimus Prime: You know, I'm actually looking for to the celebration.

Twilight Sparkle: You are?

Princess Celestia: But why?

Princess Luna: Why do you show much concern?

[Optimus looks out the window to the spot where Megatron is]

Optimus Prime: For my brother, it has always been a celebration of my victory over Megatron, but for me. [sighs] It was just a terrible reminder that I had to banish my own brother.

Twilight Sparkle: What?

Princess Celestia: Tell us more, Optimus.

Princess Luna: Why did you banish your brother?

Optimus Prime: Well,

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