I (19f) need advice with boyfriends (20m) habits

I ‘19F’ have been with my boyfriend ‘20M’ for just about one year here in a few weeks. Recently I noticed he’s been different around me and I thought I was just overthinking things. But after having a déjà vu type dream, I did the stupid thing of going through his phone. When looking through his Reddit I saw that most of the subreddits he’s in are porn based. We’d discussed boundaries with things like that before, and (I thought) we agreed it was cheating to watch it. We talked about it today, but after sitting on it for a few hours we started talking about it again and he said “I was just agreeing with you and telling you what you wanted to hear”. As well as telling me that he “canceled” the engagement ring order he’d placed. He apparently did not do this and was just saying that to upset me. I told him how it hurt me and how I didn’t understand how he could do something he knew would hurt me if I knew, and could sleep peacefully next to me. We are obviously not fine, but we’re having moments where we were normal. I just want to know if an anyone’s been is a situation like this and if there’s any advice you might be able to give me going forward?