Yes but if you make a poor decision you can always change your mind.
Yes, and to add to what Mutt said, a borderline's mind is always changing, because the emotions a borderline feels are intense, so intense that thoughts are changed to make the emotions feel better, to the point of distorting reality entirely. We all do that BTW, frame things in our mind in such a way that makes whatever it was feel better so we can live with ourselves, but take that to the extreme and add cognitive distortion and projection, like a borderline does, and the mind changes are all over the place.
Also, there's an expectation that someone will be somewhat consistent with how they show up in the world, with a decision made and then later it is decided the decision was poor, so make a new decision, with the expectation of consistency across all of that. But with "markedly and persistently unstable self-image or sense of self" and "affective instability due to a marked reactivity of mood", two official traits of the disorder, the person who made the original decision is not the same as the person looking at that decision later, a consequence of not having a fully formed self, so there can't be consistency.