Guys, why do guys follow girls social media accounts when they have a girlfriend?

My boyfriend told me he was only going to make an Instagram just to follow some sports accounts, but then later I see him following other girls accounts. Not random girls, but some girls that are his friends - I'm okay with that I guess... but then he'll follow girls he knows but doesn't like. She's cute, though. I don't understand why he does this. He said he wasn't going to go on Instagram that much anyway. Guys, please enlighten me about what following other girls means to you & why you do it even if you have girlfriend?
Guys, why do guys follow girls social media accounts when they have a girlfriend?
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