You are NOT his authority. I like what Julie Goodnight said on a recent program.
"You are the captain, and your horse is your 1st mate, who must obey orders."
I'm gonna be kind. You don't know how to lunge and your horse is slow to respond. He keeps dissing you, first by not moving quickly away from the whip and then closing the circle on you. You added fuel to the fire by annoying him with the whip by not following through. First,
watch Clinton Anderson. THIS is the end result of correct respectful lunging. (You have to pay to watch HIM do this.)
See how these horses are both calm and obedient. Yank on that halter when he doesn't yield. He is 10x your size and it won't hurt him, just establishes WHO is in charge. Second,
store your lungeline, for now. It's asking to tangle and you will be hurt, NOT your horse. Third,
teach him to lead correctly, halt when you ask, back when you ask. Fourth, use a lead rope,
a dressage whip and teach him to move his feet and yield. Go right, go left, go right, go left. I suggest 20 times for the first session. Then back him up about 20 steps. Use the whip on his chest IF he doesn't back using it on the lead in front of him, and MEAN IT!!! THEN, tie him up and let him think about this for an hour. Next session, same as the first.
I sympathize bc I couldn't get my original herd of horses to lunge. BUT, they were broken and constantly used for lessons. Any idiot could handle/ride them, so I didn't pursue it.
YOURS will hurt you, and YES, he will get more disrespectful as you tap at him like a girl fights, then let him win. Eventually he will just run you over.
You might want to get some help.
I am the kindest human and my horse's worst nightmare, depending upon their behavior. I pull out the monster whenEVER they willfully misbehave. It's worked for me for 27 years.