First and foremost, trust your instincts. If you have a feeling something isn’t right, there’s probably a reason for that. Of course, don’t let your insecurities and paranoia take over — there are plenty of innocent reasons for a strained relationship. However, there are some warning signs that his online activity isn’t so innocent. If he is overly possessive of his phone, quickly shuts his laptop or hides mobile devices when you come into the room, if he’s spending an unusual amount of time online or doing it after you’ve gone to bed, it might be time to take a closer look.