What is "nice"? Accommodating, too accommodating? Loving as one wishes to be loved? At what point is one an enabler? Where is the invisible, moving line where one ceases to be loving and becomes ... what? Over-loving? Enabling, the current term for allowing one's self-destructive partner to immolate? No, not allowing, helping the process along.
So, you are told your entire life that you are 'nice'. By even your therapist. "Nice' ceases to be a positive adjective, it becomes a pervasive worm that lives within the soul, destroying every relationship.