But you desperately needed some email boundaries. He should have had them in place from the beginning, so unfortunately the damage has been done. You've learned that you have total access to him and his help all the time via email. That just was never realistic and probably added to your difficulties at managing your emotions.

He is doing right by you right now, but it will be a painful process for you to actually use the skills to manage your emotions more often by yourself rather than always expecting that he will be there to get you through it each and every time. The transition into these healthier boundaries will take time. Just keep working at it. In the long-term this really will be much more helpful to you.