Do we really have to break up? Maybe just take a break and you'll soon miss us!
But seriously, to cancel your paid subscription, log in to your Subly account and go to your Settings (you can get there by clicking your initial top right). Look for Subscription and select change plan, click Cancel Pro to confirm. This will cancel your subscription at the end of your billing cycle which means you will not be charged again but you will still have access to Subly Pro for the rest of your billing cycle.