Your Mistake (bxb)

Your Mistake
In Song series
Based on Don't Let Me Be Yours by Zara Larsson

I fell for my best friend hard and I cannot pinpoint the moment I realised. No one ever can.
But he's never realised and I've kept a piece of me away from him despite him seeing that piece often enough.
Insecurities do a lot of damage, enough for me to never mention anything as I don't want to be a mistake he makes.
What more can I do when he confronts the other half of myself while I work?