You're in need of a biography.
The entire story is in:
The Passion of Ayn Rand by Barbara Branden
My Years with Ayn Rand by Nathaniel Branden
Ayn Rand and the World She Made by Anne Heller
Each of these books bears a different perspective, of course. Barbara's bio is colored by her being a top insider for almost two decades, than apostate. So she includes parts based on witnessing Rand and other parts not, but all based on deep research. (The movie with Helen Mirren is not all that good and does not reflect Barbara's book in hardly anything, but other than that, it's OK. )
Nathaniel's bio is actually a memoir-bio and Rand's role is diminished as she is one of four different NB women he wrote about: Barbara, Ayn, Patrecia and Devers. (btw - The acronym of the title is My War. )
Anne's book is a traditional bio and a good one. Well researched and well written.
The orthos hate these books (being orthos and all), but as time goes on, these books have become accepted by the general audience as interesting works on Rand, and reasonable at worst.
Unless you want to suffer a severe case of impotence from a massive attack of soul-sucking boredom, stay away from the attempted rebuttal by Valliant of the books by Barbara and Nathaniel. PARC is like watching paint dry while sharp fingernails scrape across a blackboard. Seriously. I've known men who have lost all feeling in their penis from reading it. One did recover after four years, though. But then he went mad and had to be institutionalized.
A couple of women I knew fared worse, they committed suicide...