if($this->Auth->login($this->request->data)) Return true with right or wrong password and iden

i will show my code
utilisateurcontroller
    public function login()
    {
            debug($this->Session->read());
        if($this->request->is('post'))
        {
            print_r($this->request->data);
            if($this->Auth->login($this->request->data))
            {
                debug($this->Auth->login($this->request->data));
                debug($this->Auth->user());
                    echo "**************************";
                //return $this->redirect($this->Auth->redirectUrl());
            }
else{

        echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++";
        $this->Session->setFlash(__('Invalid name_U or password'));

    }
}
           
            /*if ($this->Session->read('Auth.Utilisateur')) {
        $this->Session->setFlash('Vous êtes connecté!');
        return $this->redirect('/');
        echo $this->Session->flash('auth');
    }*/

}
    public function logout()
    {
        $this->Auth->logout();
         $this->Session->destroy();
        $this->redirect('/clients/index');
    }
-------------------------------------------------------------------------------------------------------------------------------------
model
<?php
App::uses('AppModel', 'Model');
/**
 * Utilisateur Model
 *
 * @property Group $Group
 */
App::uses('AuthComponent', 'Controller/Component');
class Utilisateur extends AppModel {

/**
 * Display field
 *
 * @var string
 */
    public $displayField = 'id';


    //The Associations below have been created with all possible keys, those that are not needed can be removed

/**
 * belongsTo associations
 *
 * @var array
 */
    public $belongsTo = array(
        'Group' => array(
            'className' => 'Group',
            'foreignKey' => 'group_id',
            'conditions' => '',
            'fields' => '',
            'order' => ''
        )
    );

  
    public $actsAs = array('Acl' => array('type' => 'requester', 'enabled' => false));

    public function parentNode() {
        if (!$this->id && empty($this->data)) {
            return null;
        }
        if (isset($this->data['Utilisateur']['group_id'])) {
            $groupId = $this->data['Utilisateur']['group_id'];
        } else {
            $groupId = $this->field('group_id');
        }
        if (!$groupId) {
            return null;
        }
        return array('Group' => array('id' => $groupId));
    }
        public function beforeSave($options = array()) {
        $this->data['Utilisateur']['password'] = AuthComponent::password($this->data['Utilisateur']['password']);
        return true;
    }
    public function bindNode($utilisateur) {

    return array('model' => 'Group', 'foreign_key' => $utilisateur['Utilisateur']['group_id']);
}

}
---------------------------------------------------------------------------------------------
app controller
<?php
/**
 * Application level Controller
 *
 * This file is application-wide controller file. You can put all
 * application-wide controller-related methods here.
 *
 * @link          http://cakephp.org CakePHP(tm) Project
 * @package       app.Controller
 * @since         CakePHP(tm) v 0.2.9
 */

App::uses('Controller', 'Controller');

/**
 * Application Controller
 *
 * Add your application-wide methods in the class below, your controllers
 * will inherit them.
 *
 * @package        app.Controller
 * @link        http://book.cakephp.org/2.0/en/controllers.html#the-app-controller
 */
class AppController extends Controller {
    public $helpers =array('Html','Form','Session');

    public $components = array('Session','Acl',
        'Auth' => array(
            'authorize' => array(
                'Actions' => array('actionPath' => 'controllers',
                  'userModel' => 'Utilisateur'),
                'authenticate'=>array('Form'=>array('fields'=>array('username'=>'name_U','password'=>'password')))
            
            )

          
       )
         
               
         );

     public function beforeFilter() {
     $this->Auth->allow('display');
         $this->Auth->userModel = 'Utilisateur';
       

   $this->Auth->loginAction = array(
          'controller' => 'Utilisateurs',
          'action' => 'login'
        );
        $this->Auth->logoutRedirect = array(
          'controller' => 'Utilisateurs',
          'action' => 'login'
        );
      /*  $this->Auth->loginRedirect = array(
          'controller' => 'Utilisateurs',
          'action' => 'add'
        );*/
        $this->Auth->fields = array(
            'username' => 'name_U',
            'password' => 'password'
        );
    

 }
}
?>
------------------------------------------------------------------------------------------------
login.ctp

<div class="col-md-9 col-sm-9 col-xs-12">
                               
<div style="width: 100%;">
    <div class="x_panel">
 
                                <div class="x_title">
                                    <h2>Login <small></small></h2>
                                 
                                    <div class="clearfix"></div>
                                </div>
   <div class="x_content">
<?php
echo $this->Form->create('Utilisateur',array('class'=>'form-horizontal form-label-left'));
?>
<div class="form-group">
<?php
echo $this->Form->input("name_U",array('div'=>'col-md-6 col-sm-6 col-xs-12','label'=>array('text'=>'Name','class'=>'control-label col-md-1 col-sm-1 col-xs-12'),'class'=>'form-control col-md-7 col-xs-12'));
?>
</div>
<div class="form-group">
<?php
echo $this->Form->input("password",array('div'=>'col-md-6 col-sm-6 col-xs-12','label'=>array('text'=>'Password','class'=>'control-label col-md-1 col-sm-1 col-xs-12'),'class'=>'form-control col-md-7 col-xs-12'));
?>
</div>
      <div class="ln_solid"></div>
    <div class="form-group">
   <div class="col-md-6 col-sm-6 col-xs-12 col-md-offset-3">
      
<?php echo $this->Form->submit(__('Submit'),array('class' =>'btn btn-success')); ?>
</div>
</div>
</div>
</div>
</div>
</div>
*---------------------------------------------------------------------------------------------------------------------------------------------------------------
i need your help

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