Alternate Paragraph row output in paragraphs.html.twig - output index

How do I alternate output specifically in the twig template paragraph.[myfield].html.twig? Is there any way to return the row id of a Paragraph row? My goal is to achieve something like

IF row index = 1
Show div X
IF row index = 2
Show div Y
IF row index = 3
Show div Z

...but am unsure how the for loop would look.

paragraph.[myfield].html.twig:

{#
/**
 * @file
 * Default theme implementation to display a paragraph.
 *
 * Available variables:
 * - paragraph: Full paragraph entity.
 *   Only method names starting with "get", "has", or "is" and a few common
 *   methods such as "id", "label", and "bundle" are available. For example:
 *   - paragraph.getCreatedTime() will return the paragraph creation timestamp.
 *   - paragraph.id(): The paragraph ID.
 *   - paragraph.bundle(): The type of the paragraph, for example, "image" or "text".
 *   - paragraph.getOwnerId(): The user ID of the paragraph author.
 *   See Drupal\paragraphs\Entity\Paragraph for a full list of public properties
 *   and methods for the paragraph object.
 * - content: All paragraph items. Use {{ content }} to print them all,
 *   or print a subset such as {{ content.field_example }}. Use
 *   {{ content|without('field_example') }} to temporarily suppress the printing
 *   of a given child element.
 * - attributes: HTML attributes for the containing element.
 *   The attributes.class element may contain one or more of the following
 *   classes:
 *   - paragraphs: The current template type (also known as a "theming hook").
 *   - paragraphs--type-[type]: The current paragraphs type. For example, if the paragraph is an
 *     "Image" it would result in "paragraphs--type--image". Note that the machine
 *     name will often be in a short form of the human readable label.
 *   - paragraphs--view-mode--[view_mode]: The View Mode of the paragraph; for example, a
 *     preview would result in: "paragraphs--view-mode--preview", and
 *     default: "paragraphs--view-mode--default".
 * - view_mode: View mode; for example, "preview" or "full".
 * - logged_in: Flag for authenticated user status. Will be true when the
 *   current user is a logged-in member.
 * - is_admin: Flag for admin user status. Will be true when the current user
 *   is an administrator.
 *
 * @see template_preprocess_paragraph()
 *
 * @ingroup themeable
 */
#}
{%
  set classes = [
    'paragraph',
    'paragraph--type--' ~ paragraph.bundle|clean_class,
    view_mode ? 'paragraph--view-mode--' ~ view_mode|clean_class,
    not paragraph.isPublished() ? 'paragraph--unpublished'
  ]
%}


{% set paragraph_parent = paragraph.getParentEntity() %}
{% set layout = paragraph_parent.field_layout.0.value %}


 {% block paragraph %}
    {% block content %} 
      {% if layout == "1" %}
          <div class="col-md-6" style="border: 1px solid red;">
            {{ content.field_text_flex.0 }}
        </div>
      {% endif %}
  
      {% if layout == "2" %}
         {% for row in rows %}
          {% set isEven = loop.index % 2 == 0 %}
              {% if isEven %}
                  <div class="col-md-3" style="border: 1px solid red;">
                      {{ content.field_text_flex.0 }}
                  </div>
              {% else %}
                  <div class="col-md-9" style="border: 1px solid red;">
                      {{ content.field_text_flex.0 }}
                </div>
              {% endif %}
         {% endfor %}
       {% endif %}
    
    

    {% if layout == "3" %}
    <div class="col-md-4" style="border: 1px solid red;">
        {{ content.field_text_flex.0 }}4
    </div>
    {% endif %}
    

   {% endblock %}
   {% endblock paragraph %}
   
   
  

Look at TWIG's loop.index special variable in the for loop documentation.

{% for row in rows %}
    {% set isEven = loop.index % 2 == 0 %}

    {% if isEven %}
       <!-- Is even -->
    {% else %}
       <!-- Is odd -->
    {% endif %}

{% endfor %}

You could also use:

{% set isEven = loop.index % 2 is same as(0) %}