from what i can read here your boyfriend does two things, one of them might actually be helpful, the other is not.
repeating to you the rational facts is probably a good thing, altho you need to be doing this yourself too. much of the therapy is about doing that, as you may already know. "surround yourself with rational facts as much as you can" so technically, what he does there seems to be good, altho it does upset you because he isnt acknowledging how difficult it is to not "buy into" your sa thinking. and not having sa, he will have a hard time to understand.
he helps you to avoid things, or even makes you avoid them without asking you, which isnt going to be helpful, to the contrary. during the therapy you will gradually do more and more things that you have been avoiding (i dont know where youre at, starts after a couple weeks in) - so when you bf does things for you that you can do yourself (even if theyre uncomfy or awkward), hes not helping you. which may be what causes you to feel the way you do because you might be aware of this already on some level.
so you should talk about this part with him. you need to do the things you are actually able to do at this point and avoid only those that cause you unmanagable amounts of anxiety.
sa is difficult to understand for some people. you could try to inform him about how this works and what the course of action should look like, but more than that, you cant make him -feel- it. its probably not that important for him to understand it as long as you can agree on what needs to be done.