I understand your pain, but you are the one who set yourself up for this. Apparently you WEREN'T injured (or I think you would have mentioned it), so why did you reach out to him for help? You had just told him you were going to leave him alone.
Consider for a moment how you might feel if the shoe were on the other foot. If YOU had decided you needed no contact for a bit, and he kept contacting you, and you kept telling him you will be in touch when you are ready, and then he finally said he accepted it, and only few days later you get a text for help because of a car accident? This is HIS boundary, you did not honor it, and he is enforcing it.
Minor car accidents are not emergencies. And he is not the only one who could help you if you needed help.
Accept where he is at with the relationship right now. Find other people to help if you need help.
Hugs,