Iris, who he hurt and in a way she'd never known before,

"She's not truly human. She may look it but she's a goddess and humanity is something she passes by as she delivers the messages of the gods. I fear I keep showing her the worst of us with my actions."

He walks through the door and towards Erik's room, not moving too far from him, but that space remains. Charles would gladly be closer but shouldn't be, Erik doesn't wish it, doesn't think he's allowed to have it. Also he shouldn't want it, he has Iris who wants all of him, yet as she pointed out isn't like him.