DP has just told me that 6 years ago (before me and him, he was with his ex, SIL was with my DB) my SIL told him she loved DP and would he run away with her. He also said she did the same thing every time they were out and she had been drinking. He obviously knocked her back as he was with someone and was a good friend of DB. When DP mentioned this to another friend, they admitted that she would do the same to them too.
I'm totally shocked and angry to be honest. She treats my brother awfully, always putting him down and he throws money at her which she gladly takes.
I really don't know what to do. Me and her are not on good terms due to her behaviour towards me and DP which all makes sense now. I know if I told my DB she would manipulate things to make me out to be a liar.
Just needed to vent really as I can't really talk to anyone in RL about this.