I ACCIDENTALLY DROVE A CAR IN 3rd GEAR, HELP!!?

So, it's a Chevy Cruze. There was too much stuff on the dash board to determine wether I was in drive or not, and there was not lights indicating I was in drive near the gears, like my car, or any other car that I've been in... so I drove the interstate doin about 70 thinking I was in drive, assuming there... show more So, it's a Chevy Cruze. There was too much stuff on the dash board to determine wether I was in drive or not, and there was not lights indicating I was in drive near the gears, like my car, or any other car that I've been in... so I drove the interstate doin about 70 thinking I was in drive, assuming there just wasn't any power bcus it's a Chevy Cruze, and about 15 mins down the road, the car started beeping and said "car is overheating, idle car". So I pulled over until it didn't say that anymore. I drove the rest of the way in drive, the RPMs were still pretty high, and now my friends car is messed up. What should I do? And apparently no one can fix it.
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