People shouldn't interfere with someone's love life.
Mary's friend Heather is fighting with her boyfriend Bob and thinking of breaking up with him.
Mary wants to be a supportive friend to Heather.
Mary's stays out of it but tells Heather that she is there to talk if needed.
Mary encourages Heather to break up with Bob and starts bashing Bob to others.
Heather and Bob get pas tthe rough patch and both are good friends with Mary.
Heather and Bob make up and Heather breaks up the friendship with Mary.