"That's being dramatic and that's reaching," Pavelka toldPeople in a cover story interview in the magazine's upcoming issue, according to Hollywood Life. "She has me mistaken for somebody else."
The Bachelor: On the Wings of Love couple issued a statement confirming their split on Monday night after Greek actor Gregory Michael said Girardi told him she was single and no longer with Pavelka when they met while attending a children's hospital prom near Los Angeles on Saturday and were subsequently seen kissing at a public beach party event in Santa Monica on Sunday.
It was later reported Pavelka that initiated the split because he felt Girardi was cheating with Michael, however he claims that was not the case.
"That is not what caused the breakup, but it's a factor," he told People. "I'm not going to be in a relationship that I don't fully trust."
While it might not have been the main cause of their split, Pavelka said he feels Girardi was unfaithful -- which she has denied.
"I'm not going to be surprised if more stuff comes out," Pavelka told People about Girardi's alleged infidelity. "I have no idea. I'm just putting my seatbelt on."
Instead, Pavelka claims he split from Girardi -- who has claimed that she was the one to end the relationship, not Pavelka -- because she sold her story to Star magazine, which published a cover story interview with Girardi this week.
"That seriously breaks my trust. I would never do that to her," he told People. "I am beside myself that she would dishonor the relationship like that."
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"For the skeptics out there, I followed my heart, and if I had to do it all over again, I would make the same decision over and over," he told People.
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"I don't regret what I did."
Girardi's time as one of Pavelka's bachelorettes was a bumpy one -- as she was disliked by most of the season's other women and many viewers while also gaining tabloid attention for allegedly bilking her ex-husband out of thousands of dollars to pay for breast implants while he was deployed in Iraq.
"America couldn't stand that I chose her, and I'd defend her," Pavelka told People.
"For everything to come apart like this, I absolutely feel betrayed. I feel like I don't even know her."
In addition, Pavelka also described Girardi as unmotivated once they were together.
"[I told her] 'Babe, go get your experience, and I will support you.' But sleeping until 10:30 every day is not going to cut it, and it felt like a big load," he explained to People.
"It's not my place as a fiance to financially support somebody. It's been a lack of respect and support on her part."
According to Pavelka, Girardi also became extremely jealous of the post-The Bachelor opportunities that have come his way, which have included participating in Dancing with the Stars' tenth season.
"She was watching these doors fly open for me, and it was causing an intense amount of jealously," he told People.
Pavelka has previously stated he was "saddened" by the split and claimed the two will "remain friends" -- however he told People the romantic aspect of their relationship is finished for the time being.
"In my mind it's over," he said. "I'm never going to say never but I'm not pursuing her, and she's not pursuing me."