What should I say to her?

So I have this friends with benefits relationship and I’m pretty certain I fell for her TBH. I want to tell her what I think but I got no idea how to approach the situation. I’m not head over heels for her or anything like that but I’m much happier after talking to her and I appreciate having her in my life. Even if nothing romantic comes I’d be happy just having her around.
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I forgot to mention I was the one who took her virginity. I don’t know if that’s important info.
What should I say to her?
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