I don't know what to do now that a cop caught me and didn't stop me!?

Today I was going home from school, and I was going about 75 in a 55. I came up on a Texas State Trooper and slowed down really fast when I realized the vehicle was a cop car. When I went past him he pointed at me and he had a radio out. I went on for a ways and he did not turn on his sirens or his lights and kept going and did not turn around right after I p him. Do I have anything to worry about or should I just take this as a warning to quit speeding?