Is it ok for a partner to check your phone behind your back?

Anonymous
Once I gave my boyfriend the passcode to my phone, he would go through my phone when I wasn’t around, maybe I would be in the bathroom or changing. I know this from things he would say later such as “I looked through your convo with so-and-so”. I told him to stop and just ask me, but he has kept doing it.

This time he asked me about (sexy) pictures on my phone. He asked me if I had taken any new pictures and I said no, I’ve been busy with school. He then told me he had seen ones he hadn’t seen before on my phone and accused me of lying. I told him I didn’t know which ones he was talking about. Then it was “Give me your phone.” I get the feeling this isn’t right. Is this ok?
Is it ok for a partner to check your phone behind your back?
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