Update: what were they doing? Were they sleeping together? In that case, your boyfriend is stupid. I think he knows that you’ll see the picture. He wants to break up with you or he is testing you. Better is to ask him and then break up.
I don't know they had clothes on but I couldn’t see her face because her face with cover.
He has made a mistake. This is not your fault. Ask him why the hell did he do something like that. Wait for a reasonable answer. If he gives no answer or a stupid answer, that’s a “death sentence.” Seriously consider breaking up. What he did is not fine. I’d ask for more details though.
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no i wouldn't
My ex girlfriend did this with her guy friend and it never bothered me. Our relationship ended but this wasn't the reason. It's cool because I've learned not to care lol. People have no morals or respect these days anyways. Fine by me if you're just friends.