All Points issued have one year validity from date of issue, unless you unsubscribe from your membership.
Even on pause, your Points earned do not expire prematurely (before its one-year validity). However, you do not earn new stars when you are on pause.
If you choose to unsubscribe, the Points you accumulated will expire 2 months after the date you unsubscribe. You can check your Points transactions in the app Profile > Rewards Programme