It sounds like a bad case of burnout to me. A lot of intensely dedicated home brewers experience it. Some come back after a few months or years away from the hobby; however, many more move onto something new after bringing balance back to their lives. Home brewing can become an unhealthy obsession that can dominate one's life, especially if one has an unquenchable thirst for knowledge. I have been through home brewer burnout twice, so I know the feeling. One can only burn the candle that hot for so long.