She had a LTR with a guy before moving to 'so and so'.

Then she cheated on him with 3 guys, the 4th one was me, however at the same time she is fucking a fifth guy who was in relationship and she was texting her 1st boyfriend how good she fucked him. Now she is dating him, and at the same time she cheated with me on him, however I didn't even knew he existed.

Of course I made my mistakes there and I admit it, and now I would like to know how can I show this sl*t that she needs to take fucking responsibility for her actions. She also has BPD so that doesn't make it easier and it also explains a lot.

I wanna ground her so she realizes where her fucking place is.

Any ideas? Or is there no chance since she has BPD and always rides fucking emotional rollercoaster all the time?