First of all, be honest with your boy or girlfriend. You have to be faithful with your soul mate. If you be faithful with your soul mate, your relationship will last forever. There are many problems that can occur if you are not faithful for example, if you have an affair with another person, you will quarrel with each other.it also make regret to each other. Moreover, you can be brake off relationship. In addition, if you get married and the child, your child will get many problems. You must not tell a lie story. Most couples that divorce because they tell a lie. It can be destroy dependent from each other. You should preserve the trust, then your couple life well happy.