Maybe the great “ uncoupling “ on insta coincided with them both admitting that the relationship ( such as it was ,),had fizzled out romantically.
He never was in love with her anyway, but I think they had enough in common to keep it going.
Now, it’s purely business, and the fear of reprisal, with the unspoken agreement to be discreet and not humiliate each other.
Kp keeps breaking this, which is why SB occasionally goes off in a strop and unfollows her.
I think she has realised that getting a new egg (who is prepared to play the game), is getting more difficult, so better keep SB ,just in case she needs a driver or “ loved up couple shots” for backgrid.