Behavior method won't work

I'll try to write my very first behavior that does a soft delete instead of a hard delete. I've expanded my model with

public $actsAs = array('SoftDelete');

and I've created the behavior "SoftDeleteBehavior.php" in App/Model/Behavior:

 

<?php
App::uses('ModelBehavior', 'Model');
class SoftDeleteBehavior extends ModelBehavior
{
    function setup(Model $Model, $settings = array())
    {
        
    }
    
    function delete(Model $Model, $id = null)
    {
        $Model->id = $id;
        
        if ($Model->saveField('deleted', date('Y-m-d H:i:s'))) {
            return true;
        }
        return false;
    }
}

However, when I try to delete something, the delete() method from my behavior doesn't overwrite the normal one. What could cause this issue?

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