There are two ways to handle this: 1)you could mention to h that it might be in his best interest to sign up for AAA to assist in case of an emergency if the car breaks down again, especially at night. (I don't know what type of auto insurance your h carries, but I have an additional amount added into my policy for roadside service.) or 2)if he should put the request to you again in front of the children or others, you could always say "I'm sorry, I won't be able to assist you this time, as I have another appointment that I must get to by (whatever time)". You do not need to explain the type of appointment, but you must be ready to have that excuse ready if you should ever need it.
Your h needs to grow up and he needs to learn to stand on his own two feet.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
