Cruise control stuck going down the highway

My cruise control stuck on me going down the highway. I was riding at 70 with the cruise control set and it kept speeding up and speeding up till I hit 90+ mph. Everything I did to try to stop the vehicle including literally standing up on the brake pedal didn't even slow this thing down. Finally miles down the road I was able to pull off the road and pull cables off the vehicle for the cruise control. But unfortunately it was too late. My motor blew up. We installed a new motor but I don't want to hook up the cruise control till I get this problem fixed. Can someone please help?