"In the beginning of our marriage, we had growing pains, which for those newlyweds out there who are listening and like maybe it's a little rocky, that's normal," Sean told co-hosts Shenae Grimes-Beech and AnnaLynne McCord during a Wednesday appearance on the Unzipped podcast, according toPeople.
"That's what we've come to find out," Sean, 37, continued.
"There was a bit of pressure because we did a lot of public appearances and things like that. And you have to put on a brave face, even though maybe 30 minutes prior we just got into a ugly spat at home."
Since getting married, Sean and Catherine have welcomed three children together: sons Samuel, 4, and Isaiah, 3, and daughter Mia, 1.
"He's a word of affirmation guy. So, like, whenever he's having a hard day, just being there and saying something that, he's doing a good job or 'I get it,' empathizing with him," Catherine, 35, said, according to the magazine.
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And Sean added of his wife, "She loves to be validated. It took me a long time to figure this out instead of solving her problems, which most guys I think are problem solvers."
Sean also believes committing to your best friend is "the key" to a successful and happy marriage.
"If you get caught up and looks or like the romance, whichever one, anyone who's married knows romance is going to ebb and flow. It's not always going to be hot and heavy, but you always want to be with your best friends," Sean explained.
And intimacy has apparently changed for Sean and Catherine since the early days of their marriage.
"Our favorite time of the day -- no offense to our kids -- is when we put them to sleep and we get two hours to just hang out on the couch together and watch our favorite TV shows," Sean gushed.
"She's my best friend, that's what I want to be doing with those two hours that I have alone."
Sean and Catherine are the only couple in The Bachelor's 25-season history to tie the knot after getting engaged at the show's final Rose Ceremony.