Someone who has cheated on their significant other. This apply when someone is unfaithful to his loved one, girlfriend, wife by either dating another girl or woman and having sex behind the back of his significant other which either goes unnoticed or be discovered and end up very bad.
Someone who has cheated on their significant other. He/She is not faithful to her/his loved one either by loving another person or having sex with that person behind the back of his/her wife/husband, girlfriend/boyfriend or loved one. This act of betrayal either can go unnoticed or discovered by the wife/husband, girlfriend/boyfriend which leave them devastated by the fact that the one they loved, married was unfaithful to them all that time.