Why are men breaking up with—and abandoning—their girlfriends mid-hike? Breakups tend to follow a few predictable scripts, whether it’s an ominous “we need to talk” in the living room, a tense phone call, or, if someone’s particularly terrible, a text. But apparently, some men take them to new heights (literally), ending relationships mid-hike on mountaintops, which reads like the plot to a true-crime series. Yes, this is happening in real life, and often enough to earn its own name: alpine divorce. Despite the tongue-in-cheek branding, an “alpine divorce” is anything but playful. The name nods to a 19th-century short story...