Based on blood relationship, it refers to immediate relatives such as brothers and sisters. Betrayal by these closest people is unforgivable. The betrayal of love refers to men and women in love, and no one must be loyal to each other, which is not worth taking seriously. This is why so many men and women in the world divorce and break up. This is normal. These two famous sayings can only be regarded as relative truths and can be applied under certain conditions.