I don't get it?

Why would a female (my wife) deny me access to her phone the one time I asked to see it, and I only asked because we were arguing about something and I seen that she was way more into her phone and not listening after I let her have her argument so I asked what was so important? Well at first she agreed to let me see it right after she did something and she scrolled up and down chat log and then said no because you are gonna break my phone and I said you can hold mine but she wasn't gonna let me see it so fine fuck it.
So if she doesn't want me going through her phone then why does she go through mine every chance she gets while I'm sleeping or I left my phone in the car the other day and when she got back it said SD cars was removed... wtf?
So why woulda person be likethat?
I don't get it?
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