A horse that turns toward you is not being respectful or disrespectful. He simply does not know what you are asking. So the horse does what he needs to and that is to face you.
Typically, lunging issues like this one are due to wrong positioning by the handler. The thing I have done is to use a fence line and to loosen up the lunge line and get further behind the horse to move him forward. Usually this can be accomplished just by trailing the whip behindthe horse a bit.
As the horse moves forward at a walk along the fence line you step in closer behing the horse and keep them moving straight long the fence line.
When both of you get good at this, you can start the circle. Keep is small at first. The object is for you to stay even with the horse's hip as he moves forward. If you want more speed you need to play out line and step further back (opposite the point of buttock) and if you need slwer you gradually shorten the ling and step forward so you are opposite the shoulder.
Lunging is largely a dance with you balancing the horse in a triangle between your lunge line hand and your whip hand. Lunging is very much an artform and is similar to driving a horse.
However, before you get to that, you need to show the horse what his job is.
Never work at this for more than 5-10 minutes to start and always end on a good note.. even if that is only one or two steps away from you along the fence line.
Horses respond well to your suggestions... and showing them what you want IME. If you get them thinking it is their idea it is much easier.