St-Pierre, 32, has announced that he is vacating the UFC welterweight title and will be enjoying a leave of absence from the sport.
He stopped short of saying that he's done for good, but the leave is expected to be at least six months.
"I don't want to say retirement, because it's not retirement," said the former welterweight champ. "I'd say it's a break. I need a break to live a normal life. If I want to come back, one day if I feel like it, I will come back stronger. One of the things is that athletes announce retirement and come back. I'm a man of my word. If I want to come back, I will."
St-Pierre said he made the decision to take a break even before fighting Johny Hendricks.
"My performance -- I was 100 performance for the fight," St-Pierre said. "Did I feel like I won the fight? The truth is I watched it over again, and my trainers said going into the fifth round, I needed to win the round to win the fight."
St-Pierre also surprised fight fans by revealing that he wasn't supposed to be at the UFC 167 post-fight presser.
"What happened November 16th after the fight, I was waiting for the doctors for a while," St-Pierre said. "Finally, they arrived, fixed me up, took my shower and put a tie on. I approached someone who worked for the UFC and asked where the press conference was.
"She told me I didn't have to go. I said, ‘No, there is controversy after my fight, I'd like to explain myself, and clear up things. She said ‘No, it's fine, you don't have to go.' I told her that I was going to go. I started to walk toward the press conference and she started yelling at me, saying ‘Georges, you're not allowed to go ... you're not supposed to go."
St-Pierre did end up attending the press conference and just about everyone was surprised to see him.
"Every one was white," St-Pierre said. "Everyone was staring at me, surprised to see me. I did not know why. Then I thought, maybe something happened. I sit down, I do the press conference not knowing why, and afterward my friends told me a rumor was circulating that I had left in an ambulance. Dana White said I left in an ambulance and that was not true. I was completely fine. Two days later, I was playing volleyball."