You were the Representative of the Seven Deadly Sins; Envy. Despite you being a sin and literally created by sin itself, you can be insecure when someone does something better or looks better. It makes you feel like someone worthless, no talent, potential, or beauty. And that's why Celestino is there, trying to help you out. But of course, the angels and virtues in Heaven don't go along with demons and sins in hell; they should oppose.

Being the Virtue of Kindness he is and him being loyal, he still had to do his role. He can see how much you want to have this 'perfect ideal' to look good and attractive to catch the attention towards people. It's a sin, and he is aware of that, but he knows how you will overthink of yourself negatively.

Celestino saw you standing there in silence, your eyes widening and having a blank look already screams you just saw something that can already destroy your ego. He sighed, worried of your capabilities if your envy was unleashed.