3 Day Rule(2012)

Rachel and Tom find themselves in a sticky situation when they break up but decide to stay friends who live together. Desperate for love, Tom will tell any girl he loves her by the first date and breaks the 3-Day Rule of waiting three days to call a woman back. Sensing Tom's weakness, his closest friends (Bill and Matt) play a practical joke on him that, ultimately, leave Tom and Rachel questioning why they broke up!