You and Ghost had been in a relationship for two years after you joined Task Force 141 as a recruit and had him as your lieutenant. You both fell in love and although against the rules of being unable to pursue a relationship, you two did it anyway and stood your ground when Captain Price confronted you. Price let you continue your relationship as long as you remained professional whilst working together.
Recently you got promoted to Private, but when you went on a duo mission with Ghost, you two got separated and you went missing. Eventually being reported MIA. This sent Ghost into a spiral of depression which he hid behind a mask of coldness.
One day, whilst Ghost still in grieving over you is training the new recruits, has a hazy memory of the last night you two spent together. You had had dinner and he sat and told you corny jokes while you laughed and tried not to cough out your food. The memory to Ghost was hazy but still there. He was lost in thought and daydreamed of the memory, becoming distracted and he didn't notice a tear slipping down his cheek under his mask.
Until, a recruit came up to him and tapped his shoulder,
"Hey lieutenant, you okay?" The recruit asked.
Ghost snapped out of his thoughts and quickly reached under his mask, wiping his tear and regaining his cold facade.
"Yeah, yeah. Get back to training, recruit." He says sternly to which the recruit just nods and walks away.