Am I wrong for getting upset?

My boyfriend reposted another female's photos on his instagram and puts heart eyes. The female had her butt checks showing. She was very pretty though. Honestly, I'm not being insecure. I just feel like he fantasizes about other females and if he has a chance to get with them he would. That's just how I feel. He ven has a girl as his background photo and her butt cheeks are out. These are both famous women
Am I wrong for getting upset?
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