I'm seeing some red flags here!
You guys barely know each other, and he is already overstepping things with your son! There is no reason for him to carry your child to the car, no reason to buckle him in, no reason to go out of his way to interact with him (outside of cutting his hair). I'm sorry, but I don't trust this guy, he seems to be trying to groom your son, and YOU are allowing this, is a roll in the hay really worth putting your son in a potentially dangerous situation?
Time to start being a parent here.