So, guarding your heart is the result of clear communication.
It begins with prayer to God (as Paul lays out in Philippians 4:6-7) and overflows into communication with the other person.
In other words, the key to guarding your heart is to talk to God about the relationship before you talk to the other person about the relationship. First, hearts become unguarded when you move too fast in the relationship–becoming too vulnerable too quickly.
Most importantly, they did not understand this passage to have anything to do with Americanized dating.In summary, a believer may not marry an unbeliever.If he or she does so, the believer is sinning, and the consequences for that sin will be lasting and potentially devastating.Marrying for love is a romantic notion, but romance and physical attraction are fleeting, while the spiritual consequences of disobedience to God's word are eternal.When you read most Christian dating books, one of the key pieces of counsel they provide is to “guard your heart.” They establish that guarding your heart is an essential component of correctly pursuing any dating relationship.