care and affection.
You can care for anybody. Affection is reserved for people in your very most inner circle.
I care for you by feeding you, clothing you, and providing for your needs and comforts.
I am affectionate to you by doing something small, perhaps inconsequential which expresses how dear and special you are to me.
A display of care is to use your ability to rise above yourself and think about someone else.
A display of affection is to open up your heart and make yourself vulnerable to bonding with someone else.
