Boyfriend "doesn't believe" in sharing passwords, what do I say to him?

been with boyfriend about 6 months now and it's going pretty well, I brought up the other day about sharing phone code and passwords and he said he will share his phone code but that's it, he "doesn't believe" in sharing passwords, and that people have a right to privacy, and this I don't agree with, once we've had sex, there are no longer any boundaries for us, but he's refusing to budge, do I break up with him, is he doing something wrong, or am I being pushy, I've always had passwords in relationships and regularly check their accounts to make sure they are faithyful.

Boyfriend "doesn't believe" in sharing passwords, what do I say to him?
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