Relationship lines are known as the line of marriage or affection lines. The lines are normally present below the little finger on the mount of mercury. Ancient palmistry literature provides an overview of what this line means but most palmists in the 1920s read for the elite of society, so this should be taken into account when reading your lines. Firstly, the deeper the line the better the relationships the person is likely to have in life, better communication and happiness.
If the marriage line is broken, then it can mean divorce, separated or death of a loved one. When there are a large number of lines on the palm then there will be a case where one spouse leads the other on a mission to commit an evil act. Lastly, if there are broken fragments which are overlaying, then it is a clear indicator that the couple will be separated before eventually reuniting once more. Whenever the marriage line is three quarters the size of the heart line, then the owner of such a line will marry between 30 to 35 years. On the other hand, a marriage line which is closer to quite near the heart line means they may never marry.