Should I be concerned about the fate and safety of the driver who rear ended my car?

I was rear ended on the road in the night and I couldn't see who hit me. Now I was on a busy road and wasn't able to immediately pull over so I drove a mile or so and stopped at a parking lot. The other driver didn't follow me because I never signaled him to follow me. However my car was badly damaged... show more I was rear ended on the road in the night and I couldn't see who hit me. Now I was on a busy road and wasn't able to immediately pull over so I drove a mile or so and stopped at a parking lot. The other driver didn't follow me because I never signaled him to follow me. However my car was badly damaged in the back and now I wonder if he was injured or safe. I am a bit worried with guilt>?
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