Am I wrong to be upset?

Am I wrong to be upset that my boyfriend had sent a private video of himself to a girl before we were dating? He had told me that before we were together this one girl had hit him up and he had denied her. Now I’m just finding out he sent a private video of himself to her. This makes me upset and I don’t know why he would do that and lied to me about it until now. Am I wrong for being upset about it because it happened before we were together or is it justifiable for me to be upset?
Am I wrong to be upset?
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