If you purchase a Bumble Boost or Bumble Premium subscription, it will renew automatically unless you decide to cancel it. This way you can continue to use these great features without having to worry about renewing them yourself!
If you do however change your mind, to avoid charges for the new subscription period, you must cancel it before the end of the current period. Canceling your subscription varies depending on how you first signed up, but you can check out the steps relevant for you here.
Keep in mind that deleting our account or the application from your device, does not cancel your subscription.