Paul Archuleta/Getty Images; Jerod Harris/WireImage
"Two in a half years in, it's just flippin' awkward," she said. "He won't communicate with me and co-parent."
Reached for comment on Thursday, David told PEOPLE, "In the best interest of my children, I have no comment."
In the years since they parted ways, both Shannon and David have moved on. Shannon has been dating boyfriend John Janssen for over a year, while David married his new wife Lesley Cook last October. (The two are currently expecting their first child together, a baby girl.)
"I tried to introduce [David and John] a year ago and they never met," Shannon said on Wednesday's episode. "I've never met his wife. But they've run into each other a few times."
But while Shannon and David's relationship may remain rocky, the reality star said she and John couldn't be more solid — despite hitting a few speed bumps while self-isolating together during the coronavirus pandemic.
"There were some periods during COVID when you're locked up together 24/7," she said. "I've clashed with John's kids and he clashed with mine."
"We've had arguments sparked by COVID, but we're good," she added, admitting that watching the show back has been difficult for the couple. "We're working through it."
Shannon Beador/instagram Shannon and John
Shannon met Janssen through a mutual friend and went public with their relationship last July.
Like Shannon, Janssen is a divorced parent of three and a graduate of the University of Southern California. They both studied there at the same time, though they didn't know each other. He now works as a partner at an insurance firm.
The mother of three previously told to PEOPLE that Janssen was a "great guy" with a "kind heart."
"[John's] just a great person," she told PEOPLE. "If I were to make a list of the perfect person for me, he has all those attributes. You see it in movies and you think it's not real. I've never been happier."
The Real Housewives of Orange County reunion continues next Wednesday at 9 p.m. ET on Bravo.