Found husband looking at porn

Yes...... it’s what I never thought would happen to me. I looked thru his phone only bc we have been having problems and I’m not sorry about it. We have a 18mo old son and I’m 6mo pregnant with our babygirl. We’ve been together 5years and everything has been great up until the last few months. Work has a lot to do with it bc we work at the same place, but anyway. I haven’t confronted him about it. I’m not sure how. I feel cheated on. I always heard of girls going through this and I always thought to myself it’s not cheating it’s just him being a guy!! But now I feel like such a hypocrite. I am so sorry for all the women who have gone thru this. Do you consider it cheating?? How to do confront him about it?