From The New York Times:
Patricia Highsmith said of herself, “I am always in love. . . .” Yet at her memorial service in Tegna, Switzerland, in 1995, there were no lovers from the past, and there was no lover to mourn her in the present. The service was filmed, which Highsmith would have liked, because although reclusive, she was interested in posterity. Such display also allowed Highsmith to hide in plain sight (as her hero Edgar Allan Poe put it in “The Purloined Letter”) the fact that all her relationships had failed. Highsmith had died in a hospital alone, and the last person to see her was her accountant. Highsmith was obsessed with taxes.
There had been so many lovers, usually women, but men, too, including Arthur Koestler, who had the good sense to give up. Highsmith was attractive to men and to women, until her diet of alcohol and cigarettes (she hated food) raddled her beauty. Men never fired her imagination, except in her fiction, where her males, especially Tom Ripley, are versions of herself. It was women she wanted, and she found them in bars, on boats, at parties and, best of all, in settled relationships with other people.