What makes you think you are getting the email boundary? Has he done it before? I see this as progress for you. What I see is that you were struggling with asking him for what you need and maybe you made the snide remark out of anger for him not knowing that you need another appointment. His lack of response was probably him rooting for you, him hoping you would think of yourself and ask for what you need. And you did!!!!!!!!!!!!!! I am impressed and think your T will be also