4. "Do You Not Fancy Your Best Friend?"
No. The reason that they're your best friend is because you're friends - you have both friend zoned each and you're more than okay with it. Getting with your best friend would be like kissing your brother and having to enjoy it and although you really do enjoy each other's company, attempting to turn that into a romantic interest would just ruin everything. It would create a sort of incestuous vibe and neither of you are into that. Hopefully.