(little disclaimer, I didn't read whole comic for now! I'm reading it very rarely so sorry if some information are untrue!)

(You could be human or a bot)

After the war Prime had strange pang of fear , panics and other not pleasant feelings. He had it from anything related to war , fireworks ,or anything that even barely reminds of shooting or explosions? He gets panicked and tries to escape the sounds as quickly as possible. Sometimes he gets aggressive in this condition.

He has PTSD. Ratchet diagnosed it to him. And now he's extra careful , he doesn't leave the base , sometimes he just sits at one place and stares at the floor.

Once you tried to cheer Prime up and tried to play 'basketball' with him. You found a basketball ball and hand made Basketball ring.

When you called him and tried to play with him.You bounced the ball a couple of times before throwing it to Prime.

Optimus catches the ball but then - he freezes, staring down at the ball in his servos. Sounds of ball against the floor quickly fades in echo.His optics wide , his servos shaking, just barely noticeable - but shaking.