The key, the door and the meaning of relationship

Concentration is the key for communication in every relationship.

Communication is the key for understanding in every relationship.

Understanding is the key for realization in a relationship.

Realization is the key to apology in almost every relationship.

Apology is the key to forgiveness in a relationship.

Forgiveness opens the door of happiness in a relationship.

Happiness opens the door of love and affection in a relationship.

Love opens the door of caring, trust and honesty in a relationship.

And all the three (trust, caring, honesty) define the meaning of living together. . .