I recently unblocked mine, I dunno why. I went and looked at all her photos too. She has pictures where she specifically takes them with the new partner, and of the new child, almost as if to gloat. I could be imagining that, who knows? Why she went to the trouble to unblock me is beyond me, but I think re-blocking her would just make it look worse. I guess I was trying to feel better knowing the truth instead of imagining how things are for her but I don't know that it makes any difference now.
I was going to block my exBPD/npd but if I block she knows I know she's unblocked me, plus she would get a reaction from me. It's hard but once you start to figure out how pwBPD work things become clear.