Poem's message about mailbox

answer:

Neighborhood’s not changed too much

The house still looks the same

But there stands my old mailbox

With someone else’s name

By that window there she'd hold me tight

We'd listen to the rain

The years roll by before my eyes

The pleasure and the pain

They say that people change with time

I thought we never would

But now I’m just a stranger here

In my old neighborhood

If I don't leave they'll wonder why

I'm out here in the rain

Just talking to a mailbox

With someone else’s name

Explanation: