The C + subscription on the Cupido website does not automatically renewed (non recurring).
You must take an active action yourself to renew your C + subscription. Upon renewal of the C + subscription, the new membership period is added to the time you may have left by the previous one.
One month length is counted as 30 days. Three months 90 days. Six months 180 days. One year 365 days. If you have selected the wrong type of C + subscription, you can change / delete the selected type of C + subscription, by clicking the "back" button and selecting the correct C + subscription again.