I don't know how you did it

Falling in love by chance

I don't know how you did it.
So quiet, so sly
You slipped through my guard
Whilst I looked the other way.
By the time I turned,
Too late.
Too far in to close my heart,
Too far gone to care,
So much gained, to lose
An expression, a time I never knew
So much learnt.

I don't know how you did it.
I let go.
I trusted.
I fell.