Being luckless in love is commonplace these days. But if you’re ever tempted to wallow about it, consider the romantic trials of “Downton Abbey” heroine Lady Mary. Michelle Dockery’s aristocrat lost her virginity to a Turkish diplomat (Theo James) who rudely dies in her bed. The fear of ruin drags on her like shackles.

Lady Mary eventually finds true love and a happy marriage with her cousin Matthew (Dan Stevens), who inconveniently dies shortly after she gives birth to their son and the estate’s heir, George. A few years later, she meets and marries Henry Talbot (Matthew Goode), with whom she has a daughter. But Henry was suspiciously absent from the events of the second “Downton” movie, “A New Era.”

Divorce makes for good drama in any era, but vintage society’s unspoken rules about shu

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