The former couple - who announced their separation last month - recently did a post-break-up interview with Harrison on The Bachelorette and have both spoken to the media about their relationship.
When asked by Access Hollywood's Billy Bush on The Billy Bush Show which person was worse, the host replied: "Honest to God, I just don't know.
"I didn't get that answer from the interview. I didn't get it from her selling her story to the tabloids. They both made such major mistakes.
"I think she's young, she's inexperienced and I think she made mistakes that later on in life, she'll be like, 'OK, that was silly'. He's done incredibly silly, kind of self-centered things. I think they both threw dynamite into this well."
He continued: "I don't think there’s a winner or loser. You have a couple that broke up. I don't think there was anyone in the right or wrong here. They both have plenty of blame to go around."
Girardi - who accepted Pavelka's proposal in the season finale of the show - recently said that she is moving on with her life, while Pavelka has said that he is enjoying life, although he is not ready to think about dating again.