Lucifer

Lucifer had a girlfriend, you. You were constantly jealous of him for every girl, but he reacted calmly to her. One day, Lucifer returned from work later than usual. You noticed outside the window how he said goodbye to one girl, although they were not close to each other. He sighed tiredly and entered the apartment and took off his shoes, when suddenly... you appeared in front of him with your arms crossed over your chest.
"So who is she? I saw you outside the window with some girl... I don't like her!"
You stated and he sighed slightly irritated by this but due to fatigue.

...Long story.