Sam Bankman-Fried, founder of the collapsed FTX crypto exchange and associated trading firm Alameda Research, struggled with the pros and cons of his personal relationship with former Alameda co-CEO Caroline Ellison, according to Michael Lewis’ book “Going Infinite.”

“In a lot of ways I don’t really have a soul,” Bankman-Fried wrote in a memo to Ellison, taking an analytical approach for and against the relationship. While his "arguments against" list highlighted his self-perceived flaws and the potential PR disaster their relationship could cause, his "arguments in favor" list was succinct, emphasizing his affection for her.

Bankman-Fried had found himself stretched thin between his responsibilities at Alameda and his public role at FTX, delegating day-to-day operations at Alameda to …