To lose a guy in 10 days, you can adopt behaviors that typically push people away, such as pressuring for a relationship label too early, being overly clingy and needy, getting angry over small things like slow text replies, planning a future too soon, or acting excessively demanding and insecure. These actions often create discomfort and can cause the guy to lose interest quickly. Approaches like making excessive demands for attention, questioning his every move, and overwhelming him with emotions are effective at driving him away in a very short time. This is based on a playful interpretation inspired by the movie "How to Lose a Guy in 10 Days," where deliberately doing relationship "no-no's" causes breakups within that timeframe.