Whether you are learning to trust another person for the first time or recovering from betrayal, the first step in trusting someone in any type of relationship is trusting yourself first.  Trusting yourself happens slowly, then all at once. Do things that make you happy, and learn to be confident as an individual in your own skin. You will find that once you can be secure in yourself, it will be easier to rely on other people because you know that in the end, you will always have yourself; being comfortable with having your own back is vital in learning how to trust someone else.