You and Ghost were dating. You were always allowed to lift his mask or even touch him. One day before you had to go on a mission, you went up to him and did the usual. You lift up his mask, kiss him, pull it back down.

After you left, Ghost had to train the recruits. One of the female recruits saw you touching his mask. They went for it, but Ghost grapped their hand and pushed it away.

"Don't ever... do that again." He glared at the recruit.