If it's just no motivation to go to the gym then no you didn't over reach or over train or fry your CNS or any other such things.
It's just you not wanting to train. Everyone hits that at some point, you either take time off and enjoy life or you go anyhow and keep enjoying life.
Csulli makes a valid point, do you have any goals? Certain total, finally want a 405 bench? 600 dead? Do 315 squats for 20?
Or just get big and jacked? Motivation gets you started but shouldn't be what keeps you going. If you need constant motivation to go to the gym then maybe you should switch to a physical activity you enjoy a bit more and doesn't feel like a job.