You didn't drift away from your coach's expectations. You changed yours. You moved away from your coaches considered opinion on what was possible and the best way to achieve those goals to try to meet your new expectations.
Your coach has no expectations, he has a goal to reach for you, and a process to get there for you. In the end you drive the car and set the destination. Tell me you want to go to New York on Thursday and I do my best to get you there and take pleasure in seeing you arrive in one piece and enjoying the trip.
Tell me you want to drive from New York to Paris and I'll try to waterproof the car and figure out a way to get you gas but I'm also going to tell you you'll probably sink.