Why my collection is empty when I send it? - development

Why my collection is empty when I send it?

I’m working with Laravel 5 and I’ve the following method in my Controller:

/**
 * Display the specified resource.
 *
 * @param  int $id
 * @return IlluminateHttpResponse
 */
public function show($id)
{
    $authUser =  Auth::user();
    $sharesList = Group::find($id)->shares->sortByDesc('created_at');
    $groupList = $authUser->groupsAsMember->where('id', '<>', $id);
    $group = $authUser->groups->find($id);
    $postList = Group::find($id)->posted->sortByDesc('created_at');

    $postsGroups = PostGroup::where('group_id', $id)->with('commented')->get();
    //$commentsList;

    foreach ($postsGroups as $postGroup) {
        $commentsList = $postGroup->commented;
        //dd($commentsList);
    }

    //dd($commentsList);
    return view('Pages.Group.detail', ['sharesList' => $sharesList, 'groupList' => $groupList, 'theGroup' => $group, 'postList' => $postList, 'commentsList' => $commentsList]);
}

The problem is of the $commentsList collection, if I put a dd($commentsList) inside the @foreach, I can see there’s the elements that I want inside it, but if I put the dd($commentsList) outside the foreach (after @endforeach) $commentsList is empty and it arrives empty to my HTML page, how can I solve?
I tried to put $commentsList; before the @foreach loop but still not working.

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