Gertrud leaves her successful but boring husband to pursue an affair with another man, and finds that her new love isn't any better.
It's not a particularly unique theme; Gertrud's sexual dynamics are similar to contemporary French New Wave films. (see Breathless, Pierrot le fou, Jules et Jim, etc.) The woman holds the power, dismissing men who fawn over her and proclaim their love.
Gertrud is different than Godard's women and Truffaut's women. The French are 1960's Modern. They are too cool for romance; they are too liberated for committed love. Gertrud is and older type, an Anna Karenina. She desires a perfect lover she can give herself to wholly.
Gertrud is fully committed to ideal love. She is immature, she is narcissistic, she is genuine. She's willing to sacrifice any and all happiness on the altar of poetic romance.
Dreyer doesn't. Gertrud is given the sort of end that the passionate young fear most.
Gertrud is #111 on the Top 1000 Films list I’m working on. I’ve now seen 356.
Jonathan Rosenbaum has a terrific essay on the film, and how it relates to Dreyer's family life. Reminds me a bit of Bergman's semi-autobiographical oeuvre. But I suppose the whole film reminds bit a bit of Bergman.