If you are in a Left turn lane, then the cyclist should not have passed you on your left, He wouldn't not have done that if he was driving a car would he? Then he shouldn't have done that on his bike either. I noted you were not making any hand signals showing your intentions, while you should have been doing that, the other rider AGAIN should not have passed you as he did. He was an idiot, thankfully you saw the situation happening before you made your turn and the other rider causing an accident.