What's your movie pitch idea?

Buddy movie where instead of becoming furious with his wife for cheating on him, the husband just becomes good pals with his wife's boyfriend. Eventually the wife starts feeling left out as hijinks ensue. In a climactic scene, the boyfriend resists the wife's temptations in order to help with the new business he and the husband have started together, which leads to the two guys stopping a mass shooter. The two become heroes and best friends forever. It turns out that the would be mass shooter is an ex of the wife who didn't have a friend and just couldn't deal.