Kourtney Kardashian and Scott Disick may be just days away from welcoming their third child, but insiders say marriage remains extremely unlikely for them.

The reality star, 35, is adamantly opposed to marrying her baby daddy, fearing he will never grow up and it would only result in a very ugly, costly divorce.

At the same time, she's not proactively looking to kick him to the curb either.

“While Kourtney loves Scott, there will likely never be any marriage because it would only end in divorce,” an insider said of the soon-to-be mom of three.

“There has always been a lot of concern about Scott’s partying and drinking problem, and Kourtney doesn’t want to go through a very costly divorce.”

“Family and friends have always questioned Kourtney’s decision to have kids with Scott, given all of his issues,” the source added, and that's not all.

“Kourtney also doesn’t necessarily believe in the institution of marriage after seeing what it did to her parents (Kris Jenner and Robert Kardashian Sr.).”

Clearly, the longtime couple are on different pages in many respects.

If you watch Kourtney and Khloe Take the Hamptons online, or read celebrity gossip, you know they haven't slept together in five years. Five years!

That's been the case through the good times as well as the bad.

Kourtney kicked Scott out of their rental house earlier this year, telling him, “I just think that this is going to be like a long road of figuring everything out."

At the end of the day, the eldest Kardashian sibling would “still continue to live with Scott under the same roof, with no marriage,” the source confirmed.

“However, she shouldn’t count on Scott wanting to stay forever.”

13 Photos of Kourtney Kardashian and Scott Disick That Make Us Wonder If They're in Love

1. This Ain't Good

Scott says it all with his reaction to Kourtney's third pregnancy.

“He very likely could find someone else,” the source said, adding, “Who is to say Scott wouldn’t fight her for custody in court for the kids if they ever break up?”

Wow. Sounds like the epitome of a stable, happy relationship, no?

In fairness to Scott, he's been stepping up his game. Supposedly.

Reports earlier this week indicated that Disick is sober and ready to be a better father and person as the pair gears up for the arrival of its third child.

We've heard that before, though, so we'll see if it lasts.