Good. You see what you need - to develop trust. The primary person you can learn to depend on is YOU. Are you trustworthy to you? Do you take care of yourself?
It seems he is not trustworthy. So, you can let go of practicing trust with him.
How are you taking care of you? Are you going to Alanon or Codependent's Anonymous? Do you have Codependent No More? What are you doing for you to heal and care for yourself?