Your follow-ups being normal is normal when you are strictly following the gluten-free diet. Without gluten to provoke the autoimmune reaction, there are no gluten antibodies and your body heals so the villi are healthy.
It is possible to have "silent," or asymptomatic, celiac disease. It does not mean no harm is being done to your body when you ingest gluten.
You did not say how you were diagnosed. False negatives are possible with both the blood test and the biopsy, but false positives are extremely rare.