Scott Disick

According to a new report, there's more to Sofia Richie's fear that Scott Disick will cheat.

She's apparently given him an ultimatum.

Even though Sofia Richie, Scott Disick, and Kourtney Kardashian met for what must have been a very awkward dinner last week, Sofia has lingering concerns.

Her much older boyfriend shares three kids and years of memories with Kourt.

Scott Disick had a threesome with Kourtney Kardashian and Sofia Richie on Sunday night.

But not in the way he has likely fantasized about for the past year or so.

While it's true that Scott Disick is still banging a very hot model, he may have spent a night or two on the couch.

The self-styled Lord and Sofia Richie had a very public fight. There were tears.

Even though Scott Disick is still banging a very young model, it's been a while since he bragged about Sofia Richie on Instagram.

According to a report, this has begun to hurt Sofia's feelings. 

Kourtney Kardashian and Scott Disick are both dating new people who are much, much younger than they are.

While the age differences are a little creepy, it's ultimately a good thing that Scott and Kourtney have found both found someone new to stroke their egos, as that will at least keep them away from each other ... or will it?

Scott Disick has been sure to use social media to remind Kourtney and the world that he is still banging a very young model.

His relationship with now-20-year-old Sofia Richie has lasted longer than anyone expected -- him included.

Love triangles are always difficult, but the whole situation gets even more complicated when two of the participants are pushing 40, and the third isn't even old enough to drink.

That's the lesson Kourtney Kardashian and Scott Disick are learning the hard way these days, as Sofia Richie is apparently causing major problems for their co-parenting relationship.

You don't know what you've got until it's gone; the grass is always greener; the alcoholic baby daddy suddenly looks bangable again now that he's hooking up with a model who's half your age ...

We've all heard the cliches before.

Sofia Richie is finally no longer a teenager, but Scott Disick still wants the world to know that he's banging a very young model.

But banging can have some very natural consequences, and recently, the two reportedly experienced a pregnancy scare.

In case you haven't checked in on Scott Disick in a while, and you were hoping that his cradle-robbing relationship with Sofia Richie had quietly come to an end ... we have some bad news for you.

While Disick and Sofia did break up over the summer in a brief burst rationality, they've since resumed their ill-advised romance.