Why would my boyfriend stay with his female friend if he finds her attractive?

Reemaa
My boyfriend told me about his female friend. He said their friendship is so close to the extent he knows her family and she invited him to her birthday party at her house. He told me she is attractive but he have zero love feelings toward her. I can’t understand why she is still remained as a close friend if he finds her attractive?
Why would my boyfriend stay with his female friend if he finds her attractive?
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