I feel as though communication is the most important part of a relationship. A Lot of couples don't communicate so you don't get to know the other person and you can't build trust within yourself and them. I had a situation where the communication between me and someone else was taken and they didn't know what was going on. They thought we broke up and went to date someone else, but we didnt break up so he basically cheated. Anyways, communication is the key factor in a good relationship.