Most people are on their best behavior at the start of a relationship. Only after you've been dating for a few months will the 'true person' come through. One critical area to observe is whether your date is critical of others. He/she may not criticize you, particularly at the beginning of your relationship, but if he/she is critical of others (i.e., your family or friends), this could be a red flag. The put downs or criticisms he/she hurls at others now may eventually land on you if the relationship continues.