(1) My manager should help me achieve my career goals.
(Also known as: When I get bored of this job, my manager will help me move to a more interesting one.)
Maybe he should, but almost certainly he won’t.
Your manager is primarily concerned with his own career objectives.
If he’s got his eye on a promotion, or even a sideways move, the last thing he wants is a vacancy on his team. That’s another problem that his manager will point to, and say, “We can’t promote you until you sort that out.” So he’s going to do everything in his power to dissuade you from leaving.
He may say, “Just do me this one favour, I’ll make it up to you”.
No, he won’t.