Can you be physically attracted to a best friend but not be in love?

I'm confused. I thought that was the general definition of being in love, but when I recently asked a man with mild Asperger's Syndrome, for whom I feel that way and regard it as being 'in love' with him, which my neurotypical friend confirmed, (I have mild Asperger's Syndrome, too); if he is in love with me, he described both feelings that I have, love like family, with some physical attraction; and said he's not in love with me yet, that it takes time.

Can you be physically attracted to a best friend but not be in love?
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