Yes; it's likely that you haven't completely healed. THAT said, a month into the diet and it's just as likely that you're still getting glutened by products you think are safe. It took me a few months to figure out that 'reading the label' isn't enough (depending on the company). I will say in this case you were almost certainly glutened when you ate out. Eating out = Russian roulette.
Unless it's a resteraunt that caters to celiacs (and even then!) you're gonna get glutened sooner or later. You may be incredibly lucky and visit the same resteraunt five times symptom free (and being symptom free doesn't necessarily mean that the food was safe!), then get nailed on the sixth.