I can't tell if my best friend has a crush on me
What do you think about the idea of them having a crush on you?
It makes me nervous and my cheeks turn red, that is why we never talk about it.
If you think your friend has a crush on you and you like them as well, it is always best just to talk about it honestly. Ignoring it will only make the two of you awkward and nervous around each other.
I will talk to them and see what they say. I just hope I can handle their rejection well if it comes to it.
That's very cute how the two of you are acting, but you can't play "two shy" forever! One of you is going to have to confess eventually and be honest, and it's even better you're preparing yourself for wrong outcomes. I hope you succeed.