My boyfriend is nosey?

I'm 22F & my boyfriend is 21M and he keeps asking me to see my passwords, etc. I keep saying no because I'm paranoid and it's a privacy issue (he knows I don't hide anything except passwords) and he gets upset and says I'm hiding stuff from him then by not letting him see my password + he says I don't trust him. It's like, annoying. You're my boyfriend, not my Husband, why does he feel entitled to see my passwords? Yeah, I love and trust him - but passwords are a privacy concern and I have boundaries set for a reason.
Would you let your significant other know your passwords? how do I solve this issue and why is he doing this? It annoys me.
My boyfriend is nosey?
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