what can you say to a 21-year old who touched your heart and went away?

I believe in [heaven] and know
that I should just accept it all
So content with the paths that I walk on
surely I should see it all
So take care and don't go too far,
I will miss your soul
When the distance grows
and the nights are long
and youre scared at times
and you wonder why
Take care and don't go too far
I will miss your soul
I've looked into the sky a hundred times
and I've seen the stars that shine so bright
I'm sure that one of them is you, my friend
Watching and waiting and hoping that
I'll be alright
So take care and don't go too far
I will miss your soul
And when the distance grows
and the nights are long
and you're scared at times
and you wonder why
Take care I will miss your soul
The road back home is shorter than you know

(moonpools and caterpillars)