It's good you've already been tested. IMO anyone who plans to go gluten-free should get screened for celiac first. I didn't, and a year later ended up doing a miserable gluten challenge so I could get tested.
People who don't have a problem from gluten don't end up developing one by going gluten free. There are ways other than celiac to be affected by gluten that your tests would not have shown. Some people who don't have celiac even get withdrawal symptoms when cutting out gluten. Some people find that reintroducing gluten exposes problems they have with it. If you cut it out and then experience symptoms from reintroducing it, I think you shouldn't have been eating it in the first place. Many people can go back and forth between gluten free and eating gluten without any problem.