This could be to a number of people.

We don't talk much anymore,
and this makes me sad.
We've grown apart.
We've made new friends,
and we've made new memories.
We aren't the same people we were
a few years ago.
Everything is different now.

I don't know if you will see this,
I don't know if you will read this.
But you should know that you will
always have a place in my heart.

If you need anything,
don't be afraid to ask.