He snatched his phone out my hand, why?

Anonymous
So my boyfriend and I’ve been together for two years. He’s always been a trustworthy person and always has been honest. I always look through his phone when I see him and he lets me she gives me attitude and get mad but he lets me and I also have his passcode as well. This past weekend though I looked through his phone got irritated like always but I was looking through his friend group chat with his guy friends and he snatched it out my hand he’s never done that before and I got upset he got upset and I asked him why he did that and it was he said it was because I always look through his phone I never trust him and he gets frustrating and old after a while he then proceeded to give me his phone and said look through whatever you want I don’t care. Should I be concerned that he snatch the phone out of my hand as a sign that he’s hiding something?
He snatched his phone out my hand, why?
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