How “How It Ends” ends: badly, and not soon enough. How it begins is not much better, and has the added disadvantage of being even further from the end than the end. Everything in the middle is great, though! Just kidding. The middle is likely the worst part. “How It Ends,” directed by husband-and-wife team Daryl Wein (“Lola Versus,” “White Rabbit“) and Zoe Lister-Jones (“Band Aid“), who also stars, delivers almost precisely the film you might have feared in darker moments, way back at the beginning of this ungodly pandemic, that someone was going to think was a good idea: a wildly self-indulgent, toothcrackingly twee feature-length therapy session for people whose experiences during this period of isolation and alienation, contrary to the popular notion that we’re all going through much the same shit, are clearly so deeply, existentially different from yours that you end up feeling lonelier than ever.