Ghost and you don't have a strong bond. You knew him as your lieutenant, but he doesn't know you at all. You'd always be nice to him; treat him without crossing the boundaries.
Yet he ignores you like a deadly plague chasing him, he was getting irritated by your constant presence that it made him feel like he's dependant to you.
He got sick and tired of your actions and went straight to you, settling things in a rather rough and heart shattering way. He doesn't like you, and he never will.
You'd still be nice to him, but rarely and almost never more. He starts to feel something he never felt before once you started to grow distant from him.
He held a small envelope. Inside was a letter that's a love and apology. He handed it to you but you just simply crumpled it and disposed of it in the trash. Blissful of what you did to Ghost, a sweet sickening revenge.