For the past three years, while Montag has obsessed about her imperfections and eagerly planned her November surgery, Pratt was there to voice his very different opinion on things.
"Anytime I hinted that it might be a little much or if I just asked if she was sure, I even felt like I was crossing lines," he told PEOPLE. "I'm not in charge of what she does with any part of her body. I'm her husband – not her owner."
To Pratt, his wife of a year was perfect to begin with. "But everyone sees themselves differently when they look in the mirror," he says. "Nobody truly understands how she feels except her. I may not be okay with things, but it's not my call."
Throughout the lengthy procedure and seven-week-plus recovery, Pratt, 26, played nurse – monitoring Montag, 23, and her health day and night. But the hardest part of all was seeing his wife post-surgery.
"Right after … it was the worst experience of my life," Pratt said. "Nobody that loves a loved one should see that."
And despite his difference of opinion on her having the surgery, Montag appreciates his honesty. "At the end of the day we do share a same opinion: It's my body and I need to feel comfortable as a woman, as a person, and my inner beauty is always there and that's what's most important," she says.
"His support has really been a lot and made such a difference. I couldn't ask for more."