Perhaps the problems in their relationship were overlooked because the group of friends had other problems of their own — and failed to realize that the two actually were toxic for each other.
Katie and Tom never should’ve gotten married in the first place, and if you rewatch the season, you’ll see why. From his constant need to defend his best friend and business partner, Tom Sandoval, to her lashing out and sending brutal, angry texts regardless of the matter, these two were unfortunately doomed from the beginning.
Let’s not forget Tom’s sad excuse of explaining why he cheated on her multiple times saying he was drunk and so “shitfaced,” or that he couldn’t remember but knows for sure he didn’t sleep with anyone, only made out.