My boyfriend screenshotted his best friends (a girl) snap story selfie?

My boyfriend got back in touch with an old friend who he used to be best friends with (a girl). I noticed that they were constantly texting each other through Snapchat and I said something he said they were just catching up and she was always texting him first. We were laying together and out of the corner of my eye I saw him screenshot her selfie, when it was made aware that that upset me he said he was sorry he just thought she looked pretty and he was just gonna reply to her story. I asked why he didn’t just slide up and reply and he said he didn’t know you could do that but like he’s done it to my story before, so he lied. Note: they still have been texting and sending each other picture snaps everyday for a couple weeks now. I don't know what to think
My boyfriend screenshotted his best friends (a girl) snap story selfie?
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