Boyfriend won’t share his passwords, is this a bad sign?

I told my boyfriend of two years that I would like to exchange passwords and he just said “no, not interested in your passwords” and I said “fine but I would like to have you’re still” and he hit me with “why, don’t you trust me?” And I said “it’s not that it’s that I feel YOU don’t trust ME if you won’t share” and he said “you’re not getting my passwords, there’s no need for it” and, wouldn’t discuss it anymore, I’m really pissed off now, I feel couples should have no secrets please, any advice?
Updates
+1 y
So I tried to sit down and calmly explain why this is important to me, and why I think people should share all their passwords, and his only reply was "you have the PIN to my phone, that's all you need", and accused me of not trusting him. Where do I go from here?
Boyfriend won’t share his passwords, is this a bad sign?
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