Should this be a red flag?

my boyfriend 23 and I 19 had been dating for 8 months almost 9 months now and I think he is a really sweet guy but today he told me he had a secret and the secret was that when the week we started dating he had me bent over in his car ofc nude and took a picture of me and he said he was really scared that I’d catch him. Also that he had that picture in a folder and two pictures I had sent him before he started dating so that I wouldn’t delete them from our chat. i didn’t get mad when he told me this bc I don’t want to scare him out of telling me things like that I just kinda said okay. But he did say he never showed anyone. But like is this a red flag that he’s telling me 8 months later? To be fair I send him pics a lot never with my face in it tho so I don't care that much, at some point he did try to get me to send one with my face but I didn't.

Should this be a red flag?
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