I have to be careful because sometimes I have highly confidential e-mails from my work and messages related to where I counseled for my domestic violence organization...so with that said, even though I trust my SO, I'm legally bound by law to keep those emails confidential. Once I read them, I delete them from my phone as soon as I can...sometimes the messages need to remain on the phone...such as medical information I need to keep there if we take a field trip so I have that with me in case of an emergency. Thus, sometimes, I'm not really comfortable with him browsing through my phone.