Love can also be described as Belonging.
When two people love, then they have a sense of belonging. There is someone who cares, who is ready to sacrifice for you, who is spontaneous with you (It is of course followed by lot of initial pretending).
You belong when the passions are running high or there is tranquility.
We belong to God, God belongs to us.
A mother feels that the child is hers. The child feels that mother if for her/him.