Boyfriend went through my phone without my permission and saw something that I didn't want him to see. Now what?

He basically went through my phone without my permission because it was there and I was in the shower. He saw that I had been consoling in my male friend and one of my female friends regarding my sex life with him. I didn't want him to see any of that. I'm mortified and upset that he's upset, but I don't feel like he should'nt have gone through my phone in the first place. Why was it any of his business what I tell my friends? He said that he felt I was being disrespectful to tell them such personal things, especially my guy friend who he says "is fully capable of fucking me", he thinks knows too much. While I agree with him to some extent, why is he blowing this so far out of proportion? What can I do? I tried to talk to him but he's so angry, told me that he's second guessing this relationship and that he's furious of me.
Boyfriend went through my phone without my permission and saw something that I didn't want him to see. Now what?
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