Plot
Ronny and Nick are best friends and partners in a small auto design firm in Chicago. Ronny is in a long-term relationship with his girlfriend Beth while Nick is married to Geneva. The two have recently been given an opportunity to pitch an eco friendly car to Dodge.
While at a botanical gardens planning a way to propose marriage to Beth, Ronny sees Geneva kissing a man named Zip. He comes home upset, but lies to Beth about the reason, causing her to worry that the stress of work has caused a recurrence of Ronny's gambling addiction.
Ronny makes up his mind to inform Nick about Geneva's infidelity, but puts it off after Nick expresses stress about their work. He meets with Geneva during a Blackhawks game, who promises that the affair is over and that she will tell Nick as soon as the big project is finished. Ronny subsequently discovers her and Zip continuing their relationship. Geneva then threatens to accuse Ronny of hitting on her and tell Nick about a fling they had had back in college.
When Ronny follows Geneva to Zip's house, he photographs the two of them together, but he is trapped on the patio by a group of skateboarders and is unable to escape. Once Geneva leaves, Ronny is caught by Zip and the two engage in a physical confrontation. In spite of this, Ronny eventually makes it to Beth's parents' 40th wedding anniversary party.
Ronny's increasingly erratic behavior leads his friends to think that he has begun gambling again. They hold an intervention for him but Ronny explains the truth behind his actions and Geneva admits to the affair and Ronny admits to the fling with Geneva. While Nick is upset about both, he eventually forgives Ronny and separates from Geneva for her affair with Zip. Later, Nick and Ronny have their design accepted by Dodge; and Ronny proposes to Beth.
