You can cancel a recurring purchase with your Apple ID, just follow the instructions below.
On the Home screen of your device, tap Settings.
Tap App Store.
Scroll to the bottom go the page. Tap your Apple ID.
Tap View Apple ID. Please note, you may need to sign in.
Under Subscriptions, tap Manage.
Tap the Grindr Xtra subscription that you want to manage.
Turn off Automatic Renewal to cancel a subscription.
If you are unable to find Grindr Xtra under "Subscriptions" it is likely you do not have a recurring Grindr Xtra subscription.