Massachusetts General Law, Chapter 90 §14 has the following to say on the subject:
When turning to the left within an intersection or into an alley, private road or driveway an operator shall yield the right of way to any vehicle approaching from the opposite direction, including a bicycle on the right of the other approaching vehicles, which is within the intersection or so close thereto as to constitute an immediate hazard.
If he had hit you, it would have been because he failed to yield, thus violating this statute. As I’ve discussed before, breaking a law can make a crash your fault.
The driver would even be 100% at fault if he tried to claim that you were comparatively negligent because you were riding in the breakdown lane and he couldn’t see you. That’s because the statute goes on to say that “[i]t shall not be a defense for a motorist causing an accident with a bicycle that the bicycle was to the right of vehicular traffic.”
Now that’s how you write a fantastic bike law. Other states, get crackin’.