Help!!!

So I(women) have a problem and I feel guilty. I have a big ( should I say gigantic ) crush on my best friend (women). No big deal since she is also the same with me. But the big issue is her and I are engaged. To MEN yes two different men. Someone help give me advice, tell me if I am stupid or what I should do. I love my fiancé so much I couldn't live without him and I know she loves her fiancé.