Opinions please

My husband and I have been married for 5 years. When we first got together I was very strong with what I wanted in a relationship. I had been in bad relationships with abusers and I had my son and knew what I wanted. We discussed how I didn't want porn in a relationship. About 8 months in I found out he had been on Reddit looking at girls and sending messages to them and looking at porn. I told him that with the way I feel, it is cheating just like I told him when we first got together. We worked to get the trust back and have been happily married this whole time.

I really thought I had it all, my husband works hard and still comes home and cooks and cleans and does laundry. He has been a great father to my son and we had a boy in 2016 and I am currently pregnant again with boy #3. Well I caught him looking at porn through twitter and it has come out that although he stopped for awhile he has been looking at girls for almost our whole marriage. I feel like he cheated. Going on Reddit and looking at real women posting pictures and videos of themselves. I had worked hard to get past my insecurities and we had a great sex life. It wasn't like he wasn't getting any, I literally never turned him down. He has said that he has never wacked off so I don't get why he would do it. And he knew it was wrong because he would erase his web history.

I know there are people that will say it is just porn. I am not interested in hearing that. You can replace porn with anything you choose. Alcohol or drugs or whatever is your hard no in your relationship and maybe you will understand where I am coming from.

I just don't know what to do to get past this. I told him I want a divorce because I can't trust him but I also love the shit out of him.