This is one of the most common requests about potty training. Parents are always pleased when their children train early, and your son is VERY early (especially for a boy). But then the kids get overwhelmed by the size of the parents' expectations, or get the sense that the obligations they have taken on are just too demanding.
The answer that seems to work best in most families is to lower the expectations, offer diapers again, and give the child time to regroup emotionally.
Kids surprise their parents often by showing renewed interest, or even announcing – a few weeks or months later – that they are ready. And then they are. The diapers don't confuse them or give them license to slack off – it's not slacking off. Children WANT to train when they are ready, just as they WANT to walk and talk when they are ready.
Good luck. I'm so glad you don't want your little guy to get discouraged.