If this relationship is just professional then just start going elsewhere and don't say anything. If for whatever reason you ever talk to him/her and you have to answer for your absence the most ethical thing you can do is lie. Your investment in this person isn't deep enough that you are required to be honest and that honesty serves no benefit either one of you. You will just feel awkward about hurting someone's feelings which you probably will do, and it won't make him/her a better hairstylist or be appreciative of your honesty. This is easy, it's much harder to navigate the ethical dilemma of what to do when you've had the same drug connection for sometime and then you find a better deal....