In the Gospel, Jesus said that we should do to others as we want them to do to us. This is also often phrased negatively, as in “Do NOT do to others what you would NOT want them to do to you.”
If I am interested in a woman, but I have a suspicion that she MIGHT already be dating someone else, would it be wrong for me to try to court her? I figured that if I had a girlfriend, I wouldn’t want some other guy to “steal” her away. Am I violating Jesus’ precept in this case, if I suspect (but am not certain) that she might already be dating someone else?