If it were up to me or If it was my own relationship i should be able to go through my partners phone and he should be able to go through mine. The only thing I know I won’t check are things concerning his bank account. Asides that I should be free to check whatever I want to.
I was going to counter you on this part, however I read this part
It would also be nice to note that there’s a difference between having access to my phone and being intrusive.
And I completely agree with you. For me there's nothing wrong with you having access to my phone. But going through it just makes it seem like you don't trust me.