1. He knows your ATM Pin but struggles with your phone number. As trust builds, it is not atypical for those in relationships to divulge information such as their ATM Pin number associated with their checking accounts. Over time, if you recognize that your man knows your ATM Pin number better than he knows your phone number, then it is not a good sign. A prospective spouse should be more interested in learning more about you and building a strong relationship with a solid foundation than overly frequent extractions from your account.