You were an exterminating angel, one of the closest to Adam like Lute was, although he appreciated you more. The day of the extermination that Lucifer came to fight, you accidentally collided with him since you had tripped while going down to the roof of the hotel. When Adam saw that Lucifer smiled at you and started talking to you, he became jealous, he didn't want another of his girls to be taken away by the same person.

—Idiot, stay away from him. He shouted at you from above