Why does my ex with bpd who left me stalk me on social media?

[Hello123]

My ex of 6 months left me and had a new bf 3 days after leaving me (probably talking to him longer, but I'm not sure) every fine so far. Now, 1 and a half months later im doing great in life, im doing fitness and eat much healthier im overall very happy in my life. 1 week ago i saw a fake acount watching my instagram stories and i didn't bother realy much. Couple of days later the acount startet commenting on my pictures. The account t doesn't Folow me so she is typing my name manually every time. She texted me via dms aftet i asked who she is that i changed positively and that i should done that sooner. Couple days latet she start texting like "im gonna show my self to you but its not the right time at the moment" and "i wont let you wait long, babyyy". What the f is she trying to do? She blocked me 2 days ago and still watches my stories but Blocked me again so that i dont see that she viewed my stories. Since yesterday im not blocked anymore and she still watches every storie. What does she want or think? Is she angry that im doing great? Does she want me back? If yes why? She has a new bf and i told her to go and be with him and concentrate on her relationship.
Thanks for reading

[Cromwell]

Hello, Hello123

She has a new bf and i told her to go and be with him and concentrate on her relationship.

What are your thoughts on taking things to the next level. Say, block her profile and/or tell her along the lines "i  feel stalked, leave me alone"?

[jazz guitar]

I  don't know why they do it.  Blocking/delete everything and just getting on with your day is an option.

[crushedagain]

You can't make sense of mental illness.