Being alive implies being in the process of self-discovery. This means whenever you decide to commit to being in a relationship with someone, be aware that what you are committing to (whether you know it or not) is the process of self-discovery, but together. All you have is a range of probabilities as to whether someone actually is who they think they are, much less say they are. There is no way to have an absolute guarantee as to whether someone that you meet, befriend, date or marry is who they think or say they are.