Perry dated Fisher, the half-sister of Carrie Fisher, when he was 18. In the memoir, he revealed that the pair tried to wait to take their physical relationship to the next level in the early stages, but that didn't last too long.
"My firmness, at least in my conviction to wait, lasted two months . . . The make-out sessions that didn't lead anywhere were beginning to cause both of us to hyperventilate," he wrote, adding that Fisher made the first move.
The pair broke up but eventually rekindled their relationship. "Years later, Tricia and I would date again, while Friends was at its peak," he wrote. "She didn't abandon me, but old fears crept up, and I ended the relationship."