After Price found out that you and Ghost were in a relationship, Price wanted to make Ghost a cold soldier once more. Not constantly worried about your safety during missions.

Price took things too far by getting a hypnotist to hypnotize Ghost into forgetting he was ever in a relationship with you.

You walked into the briefing room where you were told that you had to get intel. Your heart broke once you saw Ghost shaking, in the process of forgetting you.