Trust each other. To be a good best friend really doesn’t take much from you. All you have to do is make sure you can both trust each other. Don’t try to trick or use your friend to your need. You need to make them know they can trust you and let them realize that you trust them too.
Be trustworthy. If they tell you their secret, make sure to keep it with yourself. Never tell someone a secret your friend wanted you to keep. Never share their secret with anyone else. For making your bond last longer you have to keep their secrets with yourself.
Be loyal. Stick up for your friend when they need it. Trust your friend and allow yourself to be loyal with them. Through ups, downs, and disagreements, you’ll still try to work things out and be their friend, being loyal and supportive for your friend in some obstacles make them feel wanted.
When you two fight, try to work things out. Don’t say mean things, whether it is right or wrong. Apologize, but understand that things may take time to get better. Let them cool down and talk to you when they are ready to talk.