115mph and police didnt pull me over but fallowed really close, bad?

I was driving on the highway going about 115 and then slowed down to like 75. Then a few minutes later a Conn State Trooper was behind me fallowing closely and fallowed me off an exit and then got back on the highway but never pulled me over. Could he of taken my plate number down and they bill me later or do they have to pull you over if your going that fast?