Guys, Am I right to feel bothered by my boyfriend liking pictures of one woman's butt on instagram?

He knows her in real life, and she always posts pictures of herself in bikinis, specifically showing off her ass. Am I right to feel bothered by this or is this just typical guy behavior and should be expected?

Guys, Am I right to feel bothered by my boyfriend liking pictures of one woman's butt on instagram?
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