Do you give your Partner/girlfriend/boyfriend/Wife/Husband your phone passcode?

My Partner has been tripping out because I have never given Her my Phone passcode and I told her, I don't have anything to hide but I may do this like answer questions here and I really don't think it's something she needs to know? What are your thoughts on this?
Do you give your Partner/girlfriend/boyfriend/Wife/Husband your phone passcode?
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