Understanding how to return results that are NOT inside of a many-to-many relationship in laravel [duplicate]

This question already has an answer here:

• How to return rows in table1 not present in table2 in laravel 2 answers

I was wondering how I can access table information from a belongsToMany relationship in Laravel.

I currently access all addons of a specific activity using a belongsToMany relationship, the code looks like this:

Activity.php

public function addons(){
    return $this->belongsToMany( 'App\Models\Addon', 'na_activity_addon', 'activity_id', 'addon_id');
}

Addon.php

public function activity()
{
    $this->belongsToMany('App\Model\Activity', 'na_activity_addon', 'addon_id', 'activity_id');
}

I access the code like this, which works just fine:

$activity = Activity::findOrFail($id);
$addons = $activity->addons->all();

With this I receive all the addons for that specific activity.

Now, what I want to do, however, is get all addons that are NOT assigned to this activity, but are still belonging to the specific user who has this activity.

How would I need to set this relationship up?

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