After a certain point, grief can become a habit.

That's the point where it becomes in itself, dysfunctional.

Grieving is an essential part of healing, but if it goes on too long it becomes another sickness, possibly worse than the first.

“The Moving Finger writes; and, having writ,

Moves on: nor all thy Piety nor Wit

Shall lure it back to cancel half a Line,

Nor all thy Tears wash out a Word of it.”

― Omar Khayyám