So it's wrong to trust a person you've (presumably) been intimate with? Can't you have a bit of fun with someone and not expect them to * you over?
He shared it, and she made it clear she didn't want that, that's the real issue here. Taking a photo like that isn't the issue, sharing it without consent is.
She showed herself to him with consent and let him take the photo (although we have no clarity on whether it was posed for or carefully taken, he may have snapped it quickly). She gave no consent for him to show it to all of his mates and the public at large - and it was explicit that she did not want that. He did it. The end.
He shared it, and she made it clear she didn't want that, that's the real issue here. Taking a photo like that isn't the issue, sharing it without consent is.
She showed herself to him with consent and let him take the photo (although we have no clarity on whether it was posed for or carefully taken, he may have snapped it quickly). She gave no consent for him to show it to all of his mates and the public at large - and it was explicit that she did not want that. He did it. The end.