“If we don’t split now, it’ll be much harder later.” How many relationships reach that ledge, where one person says something to that effect to their partner? Many, that’s how many. Too many to quantify.

In “Together,” the droll, fiercely well-acted codependency horror movie, Alison Brie delivers the news to Dave Franco, when their characters, Millie and Tim, a put-together schoolteacher and a coming-apart musician, have gotten a little too close in tricky, arguably unhealthy ways. But is it too late? Are they stuck with each other?

The Australian writer-director Michael Shanks makes his feature debut here, and for a movie so ardently devoted to body horror — a literalization of this couple’s particular dynamic — it has an unusually sprightly sense of humor. Brie and Franco, as you may k

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