The couple, who star on MTV's "The Hills," married in 2008.
"I'm not moving out," Montag told People.com. "I love Spencer with all my heart."
"I love my wife more now than I ever thought I could," Pratt said.
Montag, who recently fired Pratt as her manager, acknowledged she and her husband have experienced some rough spots in their marriage and have even spoken in the past of splitting up.
"I was being dramatic," Montag told People.com.
"All that we've been through has only made us work harder at our relationship and making it better. We've worked through things and will continue to work on our relationship so we're the best couple we can be. We want to fall more in love with each other every day."