If he stomps off in a huff or gets very negative and shitty, like “SEE IF I TRY TO HELP YOU EVER AGAIN, UNGRATEFUL DAUGHTER” it means you’ve won. “Really, Dad? You can’t even give me a break from constantly advising me for 6 months? Did you raise me to be able to handle my own life or not?” Hold your ground. He’s retreating in the hopes you’ll follow. Don’t follow. Just sit with his negative emotions (and let him sit with them) and don’t try to soothe or fix it. Let it be weird and uncomfortable. You didn’t make it that way. HE made it that way when he deliberately ignored your stated boundaries. Don’t be the first to apologize. Let him come to you.
Another great post from Captain Awkward.