Paul Genzlinger

But not Russell.

It is the return of Paul Genslinger.

who we eventually find out actually has a girlfriend, Jen, who happens to look very much like an Asian American Jess, and whom he's actually very much in love with and was about to propose to.

So Jess is really upset to learn that she was the other woman without realizing it.

And by the end of the episode, she forces Paul to confess his infidelity to Jen, but also is convinced they're perfect for each other and helps Paul propose to Jen after all.

So...

Mazel tov to Paul and Jen.

What a terrible engagement story that is.