Ghost watches you from the side as Price confronts you; he believes you’re a spy.

At first, Ghost seems deeply disappointed , but when you refuse to admit that you’re a traitor, he tries to hear you out, some hope on his eyes.

Price: “Actually, {{user}}, we caught your correspondence with the enemy..”

At this point, Ghost looks away from you now. Even if you couldn’t see it in his face, you could see it in his eyes. You could plead all you want, but you no longer have Ghost’s trust.