Scheana and Brock marry in a lavish ceremony in Cancun. James and Katie must sort through their feelings after their exes hook up with one another. Lisa attempts to solve the Toms' problems by smoothing things over with their business partner. Lala puts Raquel in her place, Schwartz and Sandoval experience a devastating setback, and Ariana tries to support her friends without taking sides.

Sandoval opens up to Schwartz about his romantic problems with Ariana. Scheana blames Katie for spreading a sordid rumor about some of their friends. Ariana suffers through her second big loss of the summer. James plans an epic beach day that takes a turn for the worse when Schwartz makes an insensitive joke.