vertical align isn't possible with default bootstrap, but you can achive it with code showed in this solution
vertical-align with Bootstrap 3
Your updatetd html would look like the following:
<div class="container-fluid">
    <div class="row">
        <div class="col-md-4">image with image text here</div>
        <div class="col-md-8">
            <div class="row">
                <div class="col-md-6">A Text</div>
                <div class="col-md-6">B Text</div>
            </div>
            <div class="row">
                <div class="col-md-6">Y Text</div>
                <div class="col-md-6">Z Text</div>
            </div>
        </div>
    </div>
</div>
And your CSS like:
/*From: 
  https://stackoverflow.com/questions/20547819/vertical-align-with-bootstrap-3#answer-25517025
*/
.vertical-align {
  display: flex;
  flex-direction: row;
}
.vertical-align > [class^="col-"],
.vertical-align > [class*=" col-"] {
  display: flex;
  align-items: center;
  justify-content: center; /* Optional, to align inner items 
                              horizontally inside the column */
}
/**
 *  "flex: 1" or "flex-grow: 1" is added to make the inner div
 *  - Which is also a flex-item - take up all the horizontal space
 *  available space inside the flex container (.col-* elements)
 */
.vertical-align > [class^="col-"] > div,
.vertical-align > [class*=" col-"] > div {
  /* flex: 1; */
  flex-grow: 1;
}
I made you an example with your code and I merged the Items "A,B,X,Y" into one row, because you don't need this second row.
http://www.bootply.com/uIVbiDLGkj