A dating coach says she has the perfect formula for deciding whether the person you are dating is right for you. Amy Nobile, a NYC-based dating coach who charges $10,000 to work with her, has a formula called the 3-4 rule. By the end of the third date, you need to know four key principles about your potential partner: chemistry, core values, emotional maturity, and readiness. According to Nobile, most daters just focus on chemistry in the beginning, and then months or years down the line realize they aren’t compatible in other areas. (Insider)