Is this cheating?

Yesterday, I was spending the night at my boyfriend’s place and noticed a message pop up from a girl while he was on his phone next to me. He opened the chat but didn’t scroll up, so I couldn’t see much, except that he had saved a picture in the conversation. The next day, while he was napping, I got curious and decided to check it out—and I’m glad I did.

Later, I called a friend to ask if what I found counted as cheating, and apparently, he was awake and overheard me. We talked about it afterward, and he admitted that he saved the pictures because he thought the girl was attractive and used them for personal relief. He said it didn’t change how he felt about me, but I was devastated. I started crying, and he had already cried, saying he didn’t want to lose me over this.

He doesn’t see it as cheating, because he thought it was the same as watching porn, but to me, it definitely feels like it. Here are the pictures for context.
Is this cheating?
Is this cheating?
Is this cheating?
Is this cheating?
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