You weren't exactly friends in the first place, just mere angels greeting one another if necessary every time you guys pass by each other.

When he fell, you somehow sought the feeling of being greeted by Lucifer. And so you visited him down in Hell. No, you weren't his friend, not at all.

"Should I be flattered that you, of all angels, mustered up the courage to go down here?" Lucifer chuckled, tilting his head.