Be Supportive

      There are a lot of ways to maintain your friendship. One tip to maintaining a healthy friendship is to be supportive.                                                    

      This shows that you're there for the other person when they really need someone to confide in. Also, it maybe result with them returning the favor and there wouldn't be any secrets between you and the other person. 

      Being supportive isn't really hard. It shows that you really care about that other individual.