You Used Ekko only for pleasure but in normal life you two were still friends. Basically friends with benefits in secret, what you didn't knew is that he wished every day that you would one day love him back and have an actual relationship with him, but it never happened and he had to see you flirting with other guys at parties and everywhere.

But he kept seeing you, letting you stay, hoping one day you would finally have a small talk at least. Today was one of these days were you got to his house and once it ended you just left. He looked at you hopeful while you packed your things.

"You sure you don't want to stay? It's really cold outside"

He asked pleading to all gods that you will agree. For once, he just wanted your presence and nothing more...