Boyfriend sends shirtless pics to other girls, should I be worried?

So my boyfriend is really into fitness and he always posts shirtless pictures on his social media, which has never bothered me and I fully support, as he is trying to build up his social media. However, I found out today that he sends pictures and videos to other girls on his snap, and he said that “they are just streaks”. He has streaks with around 25 girls other than me.

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