Your comfort zone is a place where you keep yourself in a self-illusion and nothing can grow there but your potentiality can grow only when you can think and grow out of that zone.
Treat your relationship as if you are growing the most beautiful sacred flower. Keep watering it, tend to the roots, and always make sure the petals are full of color and are never curling. Once you neglect your plant, it will die, as will your relationship.