If I stop wearing my retainers, will my bite and jaws move back into the position that they were in prior to braces?

When I first started braces, I was happy with my bite, and my teeth were centered in front, but I had some crowding and six crooked teeth. Some of my teeth were reduced in size with tooth reshaping to help with the crowding, the teeth were straightened, and the arches were manipulated and changed. My adult braces were recently removed, and I hate my new arch because the bite of my teeth and jaws no longer fit together. My teeth hit together when I eat or talk, and it is causing tooth and ear pain.