I looked thru his phone....

So last night while my boyfriend was sleeping I went thru his messages (which he does to me all the time, idc cuz I have nothing to hide) and he never lets me on his phone so I saw an opportunity and I took it. He’s talking to a female friend that he knows I don’t like cuz she made nasty comments to me, he has all these women he works with adding him on Facebook, and he’s talking to his friends girlfriend constantly on Facebook messenger...I am so hurt because any time I even look in the general direction of another guy he gets pissed but he can just talk with other women like it’s nbd? Am I overreacting? I’m so disappointed and idk what to do...