For the longest time I hoped my BPD ex and I could rekindle some type of friendship and enjoy each others time while with mutual friends.

What I've come to realize is if I want to improve my life and build it into my dream, that I've got no time for people like her. People that don't show basic respect and kindness to others aren't worth the time or effort.

She likely unblocked you to feel some type of odd validation by "moving on" and having enough pull to try and rope you in for some type of emotional approval. We all want to feel wanted in life, but I'm guessing she'll feel her dysfunctional wanted if you reach out to her after she ghosted you. I'd bet a dollar that if she remained unblocked she'd eventually contact you with some type of half-ass apology.