My Ex Girlfriend Is Harassing Me Currently Partner And I And Especially Spreading Cp

I'm going to try to sum this up the shortest way possible. Last night my current girlfriend and I were looking through her message requests and not to my surprise, my ex was there... we opened the message and it was essentially a whole essay about how she shouldn't date me and a bunch of fantasy stories about situations between her and I that never even happened. She has BPD so this is nothing new, and not the first time she has gone out of her way to do this.

The real issue though is what else was in the message, she sent multiple nude videos of her and i together and pictures she had taken of me at the time in an attempt to try to embarrass me, under all of these photos she had like a set of instructions and was trying to get my partner to save these videos and send them around to all my followers on Instagram, which she obviously did not. But l'd like to also state that at the time these pictures and videos were taken I was only 16 years old and she was 18. And she even acknowledged that in her message and let it be known that I was underage at the time, which find very odd.

The reason I said this is not to my surprise is because this isn't the first time it has happened... she did this to another partner of mine in the past who ended up essentially turning on me and becoming best friends with her and now they go around in tandem doing this to me.

Before anyone advises me to block them, I have blocked all of both of their accounts on just about every single online platform there is, I believe that they have even more accounts to stalk me from that l'm not even aware of, because everytime I'm in a relationship, somehow the two of them find the girl and harass her.

I'm not really sure what to do about this or if it's even worth my time trying to fix, just very lost. Obviously it's illegal to some degree because I was a literal child at the time and she is aware of that, but other than that I don't know.

I asked my girlfriend to delete the message and block her as soon as I saw it, so I don't have proof anymore unless I can download the past messages again

What is the best way to go about this?

Forgot to state this before, I’m not sure who’s device these were taken off of at the time wether it be mine or hers, either way I don’t have any of this media and she does. Not sure how that could play into anything