Personally I say just keep being friends. If that's what he said, then weather he meant it or not, you should respect that. If he was lying to your friend then he'll tell you himself I'm sure.

But I say keep your friendship. What you've got is totally awesome, dont risk it.
I've liked my best guy friend for almost 6 months now and I know that he thinks us together would be awkward so I've kept it to myself. And honestly, I love just being his best female friend.
There's someting special in that type of friendship you cant get from any significant other.