weird dreams?

me and my significant other have been having dreams of us cheating on each other? im not talking to anyone or cheating and he says hes not either. but he has been lying to me about where he's at and what he does. i know everything he does and for the most part who he talks to except on facebook. but like i have no reason to ever go through his phone?? i mean i trust him with not cheating on me but don't really trust him with other things. help, with all of this. with why are we both having these dreams and everything else if possible