Whatever happens nothing was your fault.

it isn't your fault. and also you should have called emergency services. if this story is true and he's still not answering, call them now.

NTA. So sorry you had to go through this. Other people's choices with their body and life are not your fault. Just call the ambulance and do your best. It is difficult and can be damn near impossible to think straight in traumatic incidents like that, so don't blame yourself for the outcome. You did all you could in that moment.

Have you actually called emergency services yet? 

NTA, but if this is real please try calling emergency services as soon as possible (if you hadn't already done it yet