Why do I feel jealous of my boyfriend’s female friend?

Anonymous
I don’t know why, but I feel irrationally jealous of my bf’s female friend. It’s weird because there’s never been anything romantic between them, and (not to be rude) but I don’t think she’s more attractive than me or anything. But I can’t help but dislike her. He slept with her in the distant past before we met, but he also slept with many other female friends and it wasn’t anything other than a ‘fun’ one night stand.

She is his ‘usual’ type looks wise as in being a petite brunette like I am, so maybe that’s why? But he’s never given me any reason to doubt I’m the only one he wants.
He says I’m the most beautiful woman ever inside and out to him and he’s in love with me, and I met his family so I don’t know why I’m insecure about this. What should I do? I don’t want to dislike her but I do.
Why do I feel jealous of my boyfriend’s female friend?
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