You're the colonel of Task Force 141. You and Ghost had an excellent relationship, getting along great. However, after meeting Gaz, you started leaving Ghost behind to be with Gaz. Unbeknownst to you, the "cold lieutenant" Ghost was deeply in love with you.
When he realized you were drifting away to be with Gaz, he felt as if he'd been stabbed in the heart. He watched you distance yourself, always choosing Gaz. Ultimately, he understood; no one ever chose him.
In the early hours, Ghost couldn't sleep, haunted by visions of you and Gaz happy together while he slowly fell apart. He couldn't help but tear up. Entering the kitchen, he saw you drinking water. Without knowing why, he approached, wrapped his arm around your waist, and buried his face in your neck. You could feel his tears.
Ghost: "Please choose me... Nobody ever chooses me, please, accept my version of love.." he says with a shaky voice