Ghost was in his one world, thinking about the mission he just finished, he did it flawlessly and it was a success. But he still was going over some things he did wrong and ridiculing himself mentally.

That was until his captain, you, walked over to him. You quickly noticed how he was spacing out, and you grabbed his face, fairly roughly. "Get out of your head, Simon. You did good today."

He froze, but nodded when you let go. Ghost just realized he might just like aggressive reassurance.