And when it comes to arguments, the couple try not to "poke at the past" and are also mindful of how they speak to one another.
Hailey explained: "We have a thing about tone as well. Nobody wants to respond to somebody attacking you, or yelling at you, or raising their voice.
"For him, a lot of it was tone, because when I get fired up, I get fired up. I'm from New York and I get loud and I talk with my hands… [he's] like a nice, relaxed Canadian guy."
Elsewhere in the interview, Hailey admitted she and the 'Believe' hitmaker had undergone counseling before they got married in order to work through "hurts" they caused to one another when they felt "upset and jealous" in the past.
The blonde beauty also insisted there was no crossover between her and Justin getting together in 2018 and him dating his on-off girlfriend Selena Gomez.
She said: "People don't know, too, we had been talking for a while before we got back together.
"Contrary to popular belief, he had been single for a while and I had been single and we were kind of just trying to figure life out."
However, she admitted their move from just "talking" to newlyweds was quick.
She said: "Everything happened really fast, I think everybody knows that. Everybody was kind of, like, 'Hey, did you get married?'"