I asked for my boyfriends phone is that wrong?

so I asked for my boyfriends phone today because I don't trust his actions lately. for a number of reasons. well one he never wants to hang out me anymore (and we live together) which I get it he probably needs guy time. okay, now he went off on a road trip randomly with his friends. that's another thing. he's now smoking a lot of pot and he used to not smoke at all. another reason is he gets out of work, he works at a bar and he stays there for hours. now okay so I don't trust him. I just wanted a little piece of mind. now let me just let you know he's gone through my phone many times he has an app on his phone that allows him to see every text I send. okay. now fast forward. here we are today and I asked for his phone and he says no. and then I ask him why not? he said that I should trust him and I shouldn't need to look at his phone. There's something odd going on right? I'm not just some crazy girl. ugh. I'm sorry I need some help here.
I asked for my boyfriends phone is that wrong?
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