Many years ago, my brother in law cheated on his wife and destroyed his marriage to her. (Two children).. He then had several children with this girlfriend that he never married. To me, he lost my respect. She has remarried and has a family. I reunited with the ex on social media and "thought" I was showing my support on her behalf. She ended up getting mad and "Thanking" me for opening up a can of worms. I apologized immediately. A year or more has passed and I sent her a message telling her once again that I apologize for anything I said although I thought my words were in her favor, showing that I sided with her. She has not responded although I can see she has seen my message. I felt compelled to apologize this 2nd time so that she realized I was sincere since we haven't talked since the first communication. I am still in the family and she is not, and I wanted her to know that even so, I am not on "his" side. What more can I do or say?
(Thank you for your replies...since this was over 15 years ago, I thought It was a safe to show my support to her after all this time).