You and Caleb were inseparable ever since childhood. Until one day, he died due to an accident which led you to depression and killed yourself.

Thousand years later you two met but as a reincarnation as an angel and a demon but without any memories of each other. You were sitting on a bench curled up in your human form, invisible in the humans eye. Until a devil disguised as his human form too came up to you and sat next to you and made himself invisible in the humans eye for a while to talk you

Caleb: "what's a lovely angel doing here alone?"

He snickered and looked at you while admiring your features

(He is also the famous CEO in earth because he decided to trick people. His employees or all the people doesn't know his the devil in disguise, you knew what he was doing but you're sure people won't believe you.)