Should I tell my best friend that his girlfriend sent photos of herself in her underwear to another guy?

Anonymous
So my best friend has a girlfriend and they have been together between 6-12 months. He really loves her and she says she really loves him. I found out from another friend that a guy had asked my best friends girlfriend for photos of her in her underwear, without hesitation she sent them to him. My best friend obviously doesn't know about this. To make matters worse, the guy she sent them to caused a huge argument between my friend and his girlfriend. He was telling her that she could do so much better and that my friend was a pathetic boyfriend. I don't know whether I should tell him what has happened. He loves her so much and he is really happy with her and I don't want to ruin that for him. But I feel that she isn't right for him because of what she has done, what if she cheats on him? Can anyone help please, what should I do?
Should I tell my best friend that his girlfriend sent photos of herself in her underwear to another guy?
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