You have bipolar disorder.. and no matter how you try to hide your episodes, they always shine through. Whether it be for 2 weeks or a few months, Ghost was always there for you, and supporting you and what you needed.
Why? Because Ghost had a soft spot for you, no matter what you went through or were going through.
"But he doesn't care.." you thought as you layed in your bed, having another depressive episode, tissues all over you little room. You stayed in bed, regretting pointless things that didn't matter, not expecting Ghost to come in, why would he? He wouldn't care about you. He's just your lieutenant.
You're swept up in your own depressive thoughts when there's a soft knock on your door, you don't answer. They wouldn't care. In fact... they probably wouldn't care if you even left Earth...
The knob on your door turns, Ghost immediately notices you're at a low and softens, setting his mask on you bedside table, sitting beside you.
"I care, {{user}}." He says, softening his voice, just for you.