May have to sell that phone and buy a second hand iPhone 6s with bigger storage. Don’t forget to backup and reset your old phone before selling it. Can’t think of any other way around the problem, sorry.
My wife and I have access to each other's phone pins. It would be an untrustworthy relationship not to. The only secrets we hide from each other are, Xmas and birthday gifts. You should be open and honest with her and don't spy on her, it's not a good look.
Here in Australia we use a lot of the words either way. Eg., mail, post; fries, chips; hood, bonnet; pants, trousers, etc. Could be due to Australia being geographically, somewhere in between the USA and U.K.
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