Depression is lifelong. What isn't lifelong is being debilitated by it. Medication may work for some, but not for others. One style of counselling may work for one, and not another.
I've had a few episodes over the years, including a decent length of time within a rather toxic relationship, and I managed to find a really good psychologist who helped me develop strategies to reduce the thoughts and feelings that drove my mindset in those periods.
I'm nearly 9 years free of relying on medication to flatten out the peaks and troughs, and have recently seen signs of it in someone I really love. That long journey has started, and I'm really proud of them for taking those first steps to help themselves.