Here’s what I think. First, I understand why it bothers you.
But if you have to check his phone, then there’s one of two things wrong. Either he’s done something in the past to betray your trust or someone else has done something in the past to betray your trust. Either way it’s a trust issue.
If it’s someone else has done something in the past to you and he is the reason that you are concerned about this boyfriend who’s never done anything wrong, then just let it go and remind yourself that he’s a different guy and you need to trust him unless he gives you a reason not to.
If he has done something to betray your trust and you can’t let go of that then maybe it’s time to let go of him
