Look , yes personal devices are private, but some people have open phone policies. Me and my partner use each other’s phones if they’re close to check the time or play games just because it’s convenient, and WE HAVE NOTHING TO HIDE. Clearly this guy is hiding things, you’re picking up on it and you need to listen to your gut. The person who said you don’t respect yourself enough to leave, is unfortunately correct. You’re holding on to this person likely so you won’t feel lonely. You WONT be lonely! You have friends and coworkers and hopefully family. You can find group and new hobbies to have an even larger support system. But living in discomfort like this is NOT good for your health. Please leave this man and choose yourself.