Boyfriend lied to me. What should I do?

So, my boyfriend was on my phone so I decided to use his. I went to Instagram and saw that he had clicked on a girls onlyfans link. I confronted him about it since he knew it was a boundary and he saw it as wrong as well based on passed convos we had. He said it must be a glitch and he didn’t click on it. I found that very hard to believe and for a few hours I kept asking him about what he thinks happened and he finally admitted that he did click on it. He said he didn’t wanna tell me because he wanted to protect me. I told him I value honesty very much and don’t appreciate the fact he tried to gaslight me and lie to me. I asked him why he did it. We’ve never had this issue before and to my knowledge he found only fans disgusting. He said he does not know or remember details. He said he saw a girl on his Insta explore page and it wasn’t sexual but he clicked on her account and didn’t even scroll through her insta pictures. He had just saw the link and clicked it and was not expecting to find anything since he’s not subscribed and was not planning on it. He said he’s never done anything like this before. But he keeps saying he doesn’t know why he did it. It concerns me that he’s not self aware of his actions or he’s just lying to me. Im not too sure what to do next but I feel horrible and it’s really got me feeling bad. I just want to understand why he did it and I’m not even getting answers. I feel like I need to understand where he was coming from to move forward. Again, this has never been an issue so I’m confused on why after 2 years he all of a sudden felt the need to do this.

Boyfriend lied to me. What should I do?
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