Do you let your other half look at your phone or do you keep it private?

I would definitely be suspicious if my boyfriend were doing that. It seems as if he has something to hide; unless he's like that with everything. If the boy allows you to touch everything else of his & not his phone, you should start questioning what is really on that phone. My advice would be to very calmly ask him why he doesn't want you to see the phone and if he has nothing to hide, he should have no problem with at least letting you have a peak at it.