Explode your $options value by “/n” ( new line ), then do a echo in foreach:
$options = get_option('my_custom_plugin_options');
$textarea = $options['my_custom_plugin_options_textarea'];
$lines = explode("\n", $textarea);
foreach( $lines as $line ){
echo $line;
}
UPDATE #1
For reference, it’s possible to store this function in functions.php to use later in template files.
function the_textarea_value( $textarea ){
$lines = explode("\n", $textarea);
foreach( $lines as $line ){
echo $line;
}
}
hope it helps!