I find it extremely wrong, I found out my best friend was dating my ex once she was pregnant to him and they got married and had another child... Still to this day even though they are now seperated due to his abuse to her the same as me, which he abused me physically mentally and sexually also, I cannot trust her I feel sorry for her for what she went through cause I was in those shoes also but seriously they are supposed to be your friend not go sleep with your x