How to destroy class after execution?

I use custom class as library in Laravel:

class Settings
{
public function __construct($data = [])
{

   $this->settings = Setting::find(Auth::user()->id);
   var_dump($this->settings); die();
}
}

And call this:

$settings = new Settings($request->settings);
$settings->pre_update();

When first call constructor I get var_dump($this->settings); die(); as null, after method pre_update() adds data to data.

But after second click, when in data there is data and $request->settings should not be null.

Why I get null after second click?

Maybe all custom classes in laravel works as static?

via Darama