You will always need to use something for it, because it's due to a lack of estrogen. If you start/are on systemic HRT, for some women that is enough estrogen and they don't need to apply anything locally. But 20% of women on systemic HRT also need local estrogen.
Once you figure out a routine that works for you and keep it going, it should not come back. But you can't just stop everything - because then you will have low estrogen again, which is the cause of this.