Who does Katie marry at the end of The Way We Were?

In the classic 1973 film The Way We Were starring Barbra Streisand as Katie Morosky and Robert Redford as Hubbell Gardiner, Katie does not marry anyone else at the end of the film in the theatrical version that most people know. The story follows Katie and Hubbell's complex love story from college in the late 1930s through their marriage and eventual divorce in the 1950s due to political differences during the McCarthy era and differing values. At the end of the film, Katie and Hubbell meet by chance in New York in front of the Plaza Hotel, where Hubbell is with a new woman and Katie is with her new husband and child, but the identity of Katie's new husband is not prominently featured as a major character. In the original novel and extended versions, Katie remarries after divorcing Hubbell, but the film's emotional focus is on the bittersweet final meeting between Katie and Hubbell, showing they still love each other but cannot be together because of their different worldviews. The famous final line has Katie asking Hubbell if he ever loved her and his conflicted response. So Katie does move on and marry someone else after Hubbell, but the film does not make that new husband a central character; the ending centers on Katie and Hubbell's unresolved love.