How do you say i will never leave in french?

There are a few ways to say "I will never leave" in French, depending on the context and the level of formality:

Formal:

* Je ne vous quitterai jamais. (This is the most literal translation and is very formal)

* Je ne vous abandonnerai jamais. (This emphasizes the idea of not abandoning someone)

Informal:

* Je ne te quitterai jamais. (This is a more casual way of saying it)

* Je ne partirai jamais. (This is a more general way of saying you will never leave, but it can also mean you will never go anywhere)

Other options:

* Je serai toujours là pour toi. (This means "I will always be there for you" and implies that you will never leave them alone)

* Je t'aimerai toujours. (This means "I will always love you" and implies that your love is unbreakable)

It's important to choose the phrase that best fits the situation and your relationship with the person you are talking to.