I would take it as a lucky escape and move on. There are many FR pilots that have an ATPL plus thousands of hours and can't get out of the place. There are only so many jobs to go around in aviation for experienced pilots which give you a base close to home. No HR department in their right mind will employ solely from one outfit so you could well have become a statistic. Using FR as a stepping stone isn't a wise move in my opinion. It used to be when they were a lot smaller but not anymore.