What did I even do

So I had a gf with bpd, bipolar and a few more disorders. She is now my ex and has been for about 3 weeks. She’s accusing me of stalking and harassing her when I haven’t done anything. She’s going to the police and putting anything she can in files. I didn’t even do anything to deserve this treatment even if she is just having a split it’s never been this bad. She is the one who sent me a picture of her on another man’s chest, she’s the one who’s gone back to her ex. But she’s making me out to be the bad guy in all this.

I followed a girl on Instagram 2 weeks after our 6th breakup and that girl followed me back. There was no strings and no nothing, I didn’t know the girl and I never spoke to her. But my ex misunderstood it and made it all about her instead. And started sending those photos and texts. I’m just here just wondering where it all went wrong and how she can even do this.

There is no way for me to contact her and try to fix it as she just gives it to the police. I’m trying to be patient but I really think this is the end. And I don’t know how to handle it. We were together for 2 full years.