Should I have to knock before entering a room in my own home?

So I moved in with my boyfriend a few months ago and it's going pretty well except he gets really annoyed if I don't knock before entering his office, and we had a big fight about it.

He said that it's common courtesy to knock before entering a room with a closed door and I told him in my own home I should be free to go where I want and what is he hiding anyway? We ended up arguing over this with neither of us conceding and then he pulled the "at the end of the day I own the house, and it's a rule, I do the same for you" except I don't care if he knocks or not.
Yes, you should knock.
No, you shouldn't have to knock.
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Should I have to knock before entering a room in my own home?
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