Stepsister cockblocking and trying to manipulate people to feel sorry for her?

So my stepsister is bi but mostly dates women. There was a male that was my type and she even told him that he was my type and was going to set him up with me. My friends were even trying to get us together because we have so much in common. Knowing I had a crush on him she decides that all of a sudden she has feelings for him well at least that’s what she told him. Come to find out she just did it to hurt me bc of jealousy reasons and insecurities. Fast forward to almost a year of them dating (which she lied to me about until I figured it out but that’s a whole other story) she is manipulating him to stay with her by lying to him about stuff that didn’t happen in her childhood like being assaulted by a therapist that looked like the man she is dating (crazy right?) well they are no longer together due to all the really bad lying and now I have a chance she keeps causing unnecessary drama. She even told me to go for it. At what point should someone stop playing victim and trying to manipulate others to make them look bad? She has also tried to pull the committing suicide act every time she gets caught in a lie (she has not attempted) I feel this is going too far but I’m not sure how to handle the situation?

Stepsister cockblocking and trying to manipulate people to feel sorry for her?
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