Why do they call it falling?

I don't know why they say you can fall for someone.

I feel lighter than air.

My heart is soaring.

I could defy gravity if i wanted to.

I'm familiar with spiraling, 

but I've never spiraled upwards like this.

In such a short amount of time,

I have climbed to a mountain top.

I have flown to the stratosphere.

The butterflies in my stomach 

have lifted me off the ground.

If I were to fall, 

they would be right there to catch me.

Why do they call it falling,

when nothing could bring me down?