Feelings for best friend's sister

I've had feelings for my best friends sister for about 5 months now. I just told him about it recently and he took it well. He said he wants a part of me to go for it but at the same time he doesn't want me to and that he'd be ok with his sister being in a relationship with me because he knows she's in good hands. However, his sister looks at me like a "brother" and this makes me feel like absolute s***. I have no clue what to do if anyone could advise me on what to do

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