If you love someone, and really want to show that love, then care for whatever matters most to them.
Check in on their sick spouse. Hold their baby while they eat dinner. Watch their kids when school is out for the day. Give their elderly mother a ride to the store. Play with their dog. Pet their cat. Feed their hamster. Wash their vehicle after a road trip. Help carry their plants in from the cold. Hand-wash their heirloom china after a holiday meal.
Care is love manifested toward what another cherishes.