Song meaning please

Hi everybody,

I would like to know the meaning of Titanic song, because I have been hearing that song for many years without knowing the meaning. Can I get the meaning of that song?

Lyrics:
Every night in my dreams
I see you, I feel you
That is how I know you go on.

Far across the distance
and spaces between us
You have come to show you go on.

Near, Far,
wherever you are,
I believe that the heart does go on.

Once more, you opened the door
And you're here in my heart,
and my heart will go on and on.

Love can touch us one time
and last for a lifetime
And never let go till we're gone.

Love was when I loved you,
one true time to hold on to
In my life we'll always go on.

Near, far,
wherever you are,
I believe that the heart does go on.

Once more, you opened the door
And you're here in my heart,
and my heart will go on and on.

You're here, there's nothing I fear
And I know that my heart will go on.
We'll stay, forever this way
You are safe in my heart

and my heart will go on and on.