A sign that a relationship is in trouble is when one person deceives another by lying about something.?

This can create a lack of trust and communication in the relationship, leading to further issues down the line. It is important for both parties to be honest and open with each other in order to maintain a healthy and strong relationship. If one person is consistently lying or deceiving the other, it may be a sign that the relationship is in trouble and in need of addressing the underlying issues.