Friend. Ex boyfriend. Help‼️‼️‼️

Scarlett
My best friend thinks I fancy her ex which is just not the case! She knows I did used to fancy him but I don't now! I set them up together! I fancied him before they were together and we still talk a lot but it's because we are friends. Helpp! It's become so awkward, how to I assure her that I don't because I've tried telling her.