<?php $key = 0; ?>
<div class="row">
<?php foreach ($page->feedbacks as $model) : ?>

    <?php if($key > 0 && $key % 3 == 0): ?>
        </div>
        <div class="row">
    <?php endif;
    $key++; ?>

    <div class="col-sm-4">
    </div>

<?php endforeach; ?>
</div>