"Instead, he backed out - this is [three] years ago - and joined the [Miami] Dolphins. That didn't pan out well, and he was left with no TV gig until she got the show for them."
The 33-year-old star - who has been married to the retired sportsman since 2013 - views "herself as very polished and put together".
On the other hand, the source claimed she looks at Jay as "this lazy, unmotivated guy".
However, Jay has recently considered making another attempt to establish himself as a sports broadcaster, and he's even received offers from the likes of CBS and ESPN.
Kristin announced her split from Jay back in April, when she took to Instagram to reveal they'd grown apart as a couple.
The TV star - who has Camden, seven, Jaxon, six, and Saylor, four, with Jay - wrote: "With great sadness, after 10 years together we have come to a loving conclusion to get a divorce. "
"We have nothing but love and respect for one another and are deeply grateful for the years shared, memories made, and the children we are so proud of. This is just the situation of two people growing apart. We ask everyone to respect our privacy as we navigate this difficult time within our family. (sic)"