Being in a relationship indicates communication between two people. Imagine going to Facebook and changing your status to say that you are “in a relationship” when only one party agrees to those terms. You might expect some taunting or teasing for such a public declaration.
In a growing relationship with Christ, we should expect two-way communication. The Bible compares a relationship with Christ to the way a bride relates to a groom. Following Christ is a serious matter and indicates that both parties be involved intimately. Those in relationships know one another well.