Trust is a two-way street. When you're the one who is at fault for for breaking the trust in a friendship, the decision to rebuild the relationship isn't always yours. If you believe that there's hope for your friendship, start with an apology. Experts with the TeensHealth website suggest sincerely saying that you're sorry and telling your friend that you'll change your behavior. What happens after your apology is up to your friend. If she thinks that she can trust you again, she's likely to let you prove yourself as trustworthy. If not, you have to accept that the friendship is over and move on.