He sent nudes to a girl when I was with him in his apartment?

Anonymous
The guy I’m dating but we aren’t officially boyfriend or girlfriend ( I don’t even know how to determine that) , but we have been dating for a while and he went to the bathroom, meanwhile I was waiting for him in bed and he was sending nudes to my friend ( who he didn’t know was my friend). He never told me, my friend is the one who screenshotted it and sent it to me. by the way my friend does not like him, she was just leading him on to see what he does. I felt like leaving but I don’t know if it’s ok for him to do that since we aren’t official? What do you guys think?
He sent nudes to a girl when I was with him in his apartment?
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