So in the past, this t always responded to your emails in a timely fashion? And then he just recently stopped responding to your emails altogether, without any explanation?

If the answers are "yes" and "yes" I can definitely understand why you feel abandoned. That'd be pretty crappy for a t to change the boundaries without warning or discussing with the client ahead of time. I don't know how long it's been since you sent the emails, but, is it possible this t is sick, on vacation, or having email/computer trouble and hasn't had the opportunity to respond yet?