3. Commitment to Friends
It is well-acknowledged that marriages that last the longest have been built upon a foundation of a solid friendship. When you are single, it is easy to just focus on trying to find that one person to build a romantic relationship with versus learning how to become a good friend first.
It is in friendship that you learn how to be encouraging, challenging, patient and loyal no matter what. If you are a bad friend now, you will be a bad spouse later.