Boyfriend seems distant and irritated

Me and my boyfriend have been dating a little over a year now and recently he has been acting like a jerk. He doesn't talk to me as much (we live together) and everything I say or do just seems to irritate him. It started about a month ago. Also he is very sensitive to me touching his phone and looking at his laptop. He once got very defensive when I jokingly said I was going through his browser history on his cell (I was obviously playing a game). And every time he gets a text or call he turns the screen away so I can't see. I don't believe he would ever cheat on me because he has been cheated on in the past and swears that he would never ever do that to anyone. I know atm we are very stressed out but no more than what has been going on for the past year. I don't know what's going on help please I love him very much and don't want to lose him. He's says he loves me and wants to make this last but lately I don't know... :(
Boyfriend seems distant and irritated
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