What do you think about guys having nude pictures of exgirlfriend on their cellphones (while being in a relationship)?

Anonymous
The thing is that actually happened to me...
I was in a relationship with a guy (we had only 5 months in the relationship).
One day, he asked me to go out with him. Everything was fine and he started showing me pictures of him and his family on his cellphone, but then he turned to the next one and it was a picture of a naked girl showing her boobs.. he fastly turned back to the last picture and got nervous, but I had already seen it so I asked him what was that, because I felt really bad and surprised about he having that picture on his phone.
He finally told me that it was a picture that his ex-girlfriend took herself with his cellphone long time ago and that he didn't remember he had it.
I do believe what he said was the truth, but despite of that I feel like he cheated on me (you know, sometimes what you feel is the opposite of what you think) I was really sad for days, because I had made myself illusions about him and I didn't know he would be like that. I actually forgive him about that, but I still feel weird and kind of sad when I think about it.
I just want to know what do you guys (and girls too) think about this? How would you feel if your girlfriend (or boyfriend) did that to you? Would you mind a lot as I did? Or would you just let it pass. Tell me what you think.
What do you think about guys having nude pictures of exgirlfriend on their cellphones (while being in a relationship)?
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