Relationship issues

As of lately my relationship has gone to shit. All because I looked in his phone I mean is it really that big of a deal? He used to let me in the very beginning after I found dirt, than just switches up cause he wants his his way. And apparently my way is wrong. I love this guy and don’t want to lose him I just want our relationship back on track. But he’s so stuck on thinking he’s in the right and I just don’t see it.