I believe that these could be a bit of both? Most things probably aren’t meant to really happen, I just think things happen by luck and decisions. Maybe a past choice will effect something that happens in the future, and that’s set. But you could always change how something may happen by doing something at the right time, even though some things can’t be changed. Our lives are basically controlled by ourselves, our choices and such. But things can happen, and to where there’s no point of turning back. Coincidences probably just happen based on choices you have made, or maybe even by accident who knows.