get_post_meta pagination

On a singular view, the current page number can be accessed with get_query_var('page'). You need to subtract 1 to get the corresponding array value. Note that the first page will redirect to the URL without page number, this is just a thing WordPress does.

// get meta
$metas = get_post_meta( $post->ID, 'your_meta_key', false );

// get page number
$page = get_query_var( 'page' );
$page = $page > 1 ? $page - 1 : 0;

// output meta for this page
if( isset( $metas[$page] ) ){
    echo $metas[$page];
}