RICH PEOPLE ANNOY ME

Lisa is throwing a dinner party for her friends to hopefully smooth over some tension that has been brewing. She decides to have Katie and Stassi serve the meals while Jax, Tom and Ariana mix the drinks. Of course Tom and Ariana working behind the bar together causes tension elsewhere, making for a very chaotic night for Lisa.  Things are already heated between Kristen and Tom but when he finds out they are working Lisa's dinner together, they go from bad to worse. Kristen has a full meltdown and accuses Tom again of having hooked up Ariana. Tom has basically hit his limit and things are left up in the air between the two of them. Ariana decides it might be best to have a conversation with Kristen and tell her that nothing happened between her and Tom. But Kristen doesn't believe her because of Tom's behavior and Ariana tells her "that's not my problem." Nothing is resolved and we are left to question - what is the truth? Is Kristen valid in her belief that Tom and Ariana hooked up? Are they lying to everyone and keeping this big secret to themselves? Or are they telling the truth and maybe its Kristen who has a secret?