1. Yes
2. They do depend on what the T is comfortable with. And they often vary from client to client based on what the client needs (not wants). He sees how much you want to physically be close to him and that's probably why he won't let you touch him. That probably won't change no matter what you say or do.
3. He can tell you his feelings if he thinks it's BEST for you. It doesn't matter what you want, it matters what is the best for you. For example, medicine tastes gross but you sometimes need it to live. Sugar tastes good, but it is bad for you. In the same way, he has to make the decision based on what is the best for you.

Boundaries do hurt, but they are necessary.