My ex girlfriend went from nasty to nice?

In June last year me and my girlfriend decided to part ways but stay friends.

How ever, as "friends" she would belittle me and be very nasty in her messages and calls so I decided to tell her that I could no longer be her friend and i blocked her on everything. After one month of keeping her blocked, I unblocked her and right away she sent me a very kind message saying

"Hey, I hope you're well, I just wanted to say sorry for all the stress , in the past, you're really nice and forgiving, you're a great guy, thanks for being that way but hey! I gotta go , take good care of yourself"

I sent one back saying "thank you, I'll see you round" and then she just let that one on seen and didn't reply. Which is really odd for her cause she has always replied to any message and has always been very full on with her words.

What's happened?

My ex girlfriend went from nasty to nice?
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