Imagine a Big Triangle.

The Self Esteem Triangle often goes like this: you are at the mid left of the triangle, you are doing okay, even well, and slowly starting to make your way up to the top point of the triangle.

Once you are near the top (which is actually just healthy self-esteem) it feels kinda shaky, and then something ever so slight can knock you down so you are now sliding down the right side of the triangle and then hanging out down at the bottom again until you work your way back up, again, over and over.