My sister is friends with my ex boyfriend who cheated on me. Her husband is friends with him so she is also friends with him. Now he has a new girlfriend and she is friends with her. I know my ex boyfriend's girlfriend is trying to get under my skin. My ex is doing this also because I broke up with him and hurt him. I know that there loyalty is to my ex so they will never tell her he's a cheater. My sister's husband even lies to my sister and his loyalty is for his friends over his own wife.