I've really had to debate with myself whether to write this post on here because I know my Dsis comes on MN but I really need some perspective from someone who is not emotionally involved in all of this.
My Dsis (18 mo older than me) broke up with her EA ex (which she's in denial about the abuse) of 4 years back in October. I was in my own EA relationship (which I was in denial about at the time) and my ex invited a few friends round to my house who had come to stay with him (they were from his home town 200 miles away). My Dsis was feeling down about the breakup so I invited her over to join us.
My Dsis and one of my exes friends ended up sleeping together that night (which according to her was pressured and unprotected). He went home (200 miles away) a couple of days later so they spend around 2 days together.
A week later, I found out my ex had been prolofically cheating on me. Strip clubs, porn, dating sites, sending women lewd messages on Facebook. I realised after this he was abusive and a narcissist and a dangerous man as he'd abused previous partners and I could now see how EA he was to me. I also found out he has a reputation for this in his old town, everyone knows and I know all of his friends knew (who I know now are also unsavoury characters). About a week after I'd broken up with him, he started a campaign of harassment messaging me, my family members and even my boss to try and get me fired. I have worked many years for my career and my boss is like a father figure to me (he was my undergraduate supervisor at uni) so this was particularly devastating for me. My ex is in court next week so this is all very raw for me still and I feel I have a battle ahead of me.
My Dsis was fully aware of what I was going through as we often confide in each other and when it first happened, I told her how uncomfortable I felt that she was choosing to continue seeing this guy she had known for 2 days when he was friends with my ex (he'd gone back home at this point so could have easily just not seen him again). She basically decided to keep seeing him and I said I dont want to hear anything about him and I dont want him anywhere near me or my children. I know she is an adult and in any other circumstance I wouldnt mind her seeing this guy but he is friends with my abuser and he very likely knew he was abusive and cheating on me. Someone who has put me through hell, destroyed my confidence and nearly cost me my career. I'm worried that he's feeding back information about me to my ex and with the court case coming up, I just cant bare it. My sister is also a witness in the case as my ex sent her messages about me.
What makes it worse is that this guy has so many red flags himself and she just cant see it. He wouldnt tell her his age, changed the number of people he told her he'd slept with from 3 to 10, has a reputation of being a player, pressured her into unprotected sex on the first night, said he had family from a certain part of the country so she paid for them to fly there and the day before said that he actually didn't have family from there (why lie?), is an alcoholic, lies about where and who he is living with, told her he loved her when they had only met twice. He says he is no longer friends with my ex and that she doesn't really talk about me with him but I know its bullshit and it's impossible to be in a relationship with someone and not let slip things about your sister and family. I might be overreacting but I dont want my ex to know anything about me, no matter how trivial.
They've met about 5 times since October and she is now bringing him to family events (most recently a family funeral so I didn't go) and allowing him to stay at her house with her young daughters. I've told my parents how much this is upsetting me and they basically said just because my ex is a bad person, it doesnt make him one but then why would he be friends with someone like this if he doesnt condone this behaviour?
What's even worse is that she also has feelings for a male friend who lives locally, is a lovely guy and she has known since school but she cant decide who she wants to be with (nothing has happened yet with this guy) and rings me to talk about it despite me saying I dont want to talk about my exes friend. Why would she keep seeing a guy who she's clearly not sure about when she knows how upsetting I'm finding it and could lead to me just cutting her out of my life.
I know she is a victim of abuse and has low self esteem which is why she's loving the attention from this dickhead and falling for the bullshit but I feel like her need for validation from men is more important to her than her own sister. I could honestly cut contact with my parents too over this as it's a pattern in my family where no one cares how things affect me. I was sexually abused by my Dsis's 19 year old boyfriend when I was 11 (she was 13) because my parents wanted to stop her running away with him so they let him stay in the house. This happened again when I was 14 with another of her boyfriends who was 19. I know that isn't her fault but all of those feelings are being brought back to me by this situation.
What should I do?