You can read the bios yourself. After Arline he went on his "debug how to sleep with women binge" and then slept with his students' wives. Most complained that none of them could live up to his dead wife, and the more ill-treated ones wrote to the others saying that the best way to get out of a Feynman relationship was to make a few dollars by claiming to have missed your period.

This is all passed over quite briefly in Genius, but you'll find more evidence elsewhere.