Context please. What are we viewing? Back up and take a picture from a distance.

Look at the first picture, left side of the tile against the wall. The row stops 2/3s of the way down because the wall is not square. What do we do about that? (here's another view)

You can try using a metal trim.

This could have been prevented. An experienced Pro tiler would have measured the area and, when it was found to be "out of square", corrected the wall before starting to tile. This is why Pro tilers are in demand...and are paid well for their expertise. At this point adding a metal strip to both sides is the solution.

Or a solid surface rectangular or cove type inside corner piece.

Our walls, window, tub . . . not as square as our tile guy wanted them to be. He laid everything out beautifully, then along the top where there was more gap down to almost no gap, he said he could cut tiles to fit . . . we also had matching pencil trim pieces instead of metal, so he installed them along the top, shaving down pieces where it narrowed. Our older house is WAY out of square as was the glass block window my husband previously installed. Our tile guy saw the problem and worked with it so that we have a great space with the 'out of square' problem blended in so that it is imperceptible. He actually spent some time considering alternatives to this before he began. We used 3x6 glass subway tiles in a stacked (not brick) pattern.

Sorry to hear, hope you have an easy and quick fix with your installer.

He asked for a second look before grouting and we talked about options. He offered to take another shot at cutting smaller pieces to finish out the row and made it work.

I guess I still want to know what we are looking at it seems like you created a problem with that big square in the center that i hve no ide what it is.

It's tiling over a vanity with a mirror planned for the space.

Vertical tiles are difficult to do when the wall is off... unfortunately that wasn't caught beforehand. How much of a space is it really? Can he feather out compound on that adjacent wall to fill in some of that? If it is small enough, I wonder if it will blend away with the grout? Or use a paintable caulk and have the wall paint create a "new corner".

I 'm sure you will come up with some trick to make this blend away...

Good luck!

Making it work by putting in slivers is not necessarily a great solution in my opinion. Even if the gap has been filled in with cut pieces, I would use a piece of trim on each side to provide a better finished look. There will still be a non-uniform reveal because of the skinny tiles, but it will be cleaner and not as obvious.

"Do you have an easy and quick fix with your installer. If so, please contact any local installer for quick fix."

What?

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