Committed

Nate loses a bet to Bowie and has to buy him a $29 hamburger from an upscale restaurant. On their way to the restaurant, Nate gets into an argument with a homeless man at the ATM and accidentally knocks him down. Marni witnesses the incident and gets the mistaken impression that Nate was deliberately cruel to an innocent vagabond. Nate spends the rest of the afternoon trying to befriend the homeless man to get back in Marni's good graces.

Marni and Nate are invited over to Todd's apartment for dinner to meet his new girlfriend, Natalie. While at dinner, the mood intensifies as Todd pays attention to Marni and ignores Natalie. Nate confides to Marni that he believes Todd set the dinner in order to set up Natalie and Nate, who appear to be a perfect match. Obsessed by the idea that she and Nate may not be the perfect match for one another, Marni orders Nate to date Natalie. Marni later comes to regret the decision and vents to Tess and Bowie.

After getting drunk with Todd, a hungover Nate wakes up in Natalie's bed, with no memory of what happened the night before. Nate panics and heads to Marni to assure her that nothing happened between him and Natalie. He asks that she believe him and Marni decides to take his word. Nate, unsure of what really happened, decides to go back and ask Natalie about the night's events. Elsewhere, Tess baby sits a new kid, Zach, who asks her to pose nude for his friend. Meanwhile, Bowie decides to promote his new CD at the marathon, using paper cups to advertise its release.