Photo/women.com
Different societies subscribe to different norms when it comes to relationships.
People have different ideas and takes on what is wright and what is wrong in a relationship ,when it comes to your current partner or even your ex.
Most people would find it wrong and distasteful for you to date their EX's when you have a relationship with them, either family or friends.
Your mutual friends and even the person you are related to would start thinking that you are the reason for their break up and get all the wrong impressions about you.
It is never okay to date your friends' ex as it might end up ruining your friendship with them or your family ties.
Not doing this also shows a lot of respect for this person.