Blaming infidelity for homosexuality 

She met Jack Dunphy, then a dancer with the Littlefield company, in 1937. They married in 1939 and separated after Dunphy's service during World War II, during which McCracken had an affair with French composer Rudi Revil. Dunphy was devastated by the infidelity and blamed it for his change in sexual orientation. He adopted a gay lifestyle, became romantically involved with Truman Capote, and he and McCracken were divorced in 1951. Dunphy remained Capote's partner until his death in 1984.

I'm skeptical of the statement that Dunphy simply chose to be gay after the affair.  This sounds like sneaky POV pushing.  For the most part, the consensus is that people are born gay, they don't choose it.  I think the sources need to be looked at a bit closer here or at the very least, properly attributed to the authors.