Woke up and saw my boyfriend going through my phone. Do you go through your girlfriends phone? If so, why?

Is it because I caught him looking up a young girl from his work on Facebook?
Is he trying to find dirt on me so he has an excuse to cheat. I don't know. That’s all I can think of because he didn’t find anything cause I’m loyal.
I don't know what he was looking for? Do you go through your girlfriends phone and if so why
Woke up and saw my boyfriend going through my phone. Do you go through your girlfriends phone? If so, why?
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