A flaw will be nothing more than a teeny tiny fly in the ointment that is your relationship. A deal breaker could start out as an undesirable quality in the early stages of your relationship, but will manifest itself in more serious ways. For example, if he leaves things to the last minute or doesn’t pay attention to details, decide if one of the values he has, for example, ‘learning and growing as a person,’ could be something you leverage to work through those behaviors. Over time, a man who wants to learn and grow, will take steps to make adjustments and improve in those areas. Remember, according to the Gottman Institute, one of the foremost research organizations that focuses on what creates happy and fulfilling relationships, 69 percent of HAPPY couples have challenges that are perpetual. Distinguishing between which are the most important will be crucial to your ability to rule in versus always ruling out.