I don't see why he'd terminate over this. He can block you phone number/ mails should he really need a break. That way he'd see you only in session and you two can agree on a phone number (your friend/partner- so you have to take a break and go and get it) should you really need to contact him re scheduling... Seems drastic but it's better than terminating. Could work if you truly cannot (yet) control yourself...

Canceling seems like a bad idea you really should talk this out.