If she wants to look through my phone shouldn't I be able to look through hers?

My girlfriend wants unlimited access to my phone and laptop because in the past i was unfaithful. I told her ok but i wanted the same in return. She vehemently denied my request so i told her no i will not give her my passwords. My thought is if you have nothing to hide then you have nothing to hide. Am i wrong for asking for this in return or is this a red flag.

In the past she has managed to get my passwords or guess them and gone through my stuff while i was asleep I just used a password that she can't hack this time.

If she wants to look through my phone shouldn't I be able to look through hers?
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