Advice?

I fell asleep early the other night and woke to my partner beyond fuming at me. He'd gone through my snapchat, instagram, facebook and even my web browser history. Of course he looked well and truly into my shit, like he was looking for something to be mad about. And yep, he found a photo sent before him and i even got together and that was world war 3, i choose to sleep on the floor (almost 13 weeks pregnant) and his now become distant. A few friends have said males only do it when they're hiding something or cheating. Whats your opinions? Lack of trust in me or?