He really didn't want to see her again.
He was worried that the illness he'd been feigning would be exposed in front of the Divine Doctor.
"Of course it's for your own good," Yan Qianyi said earnestly, "Think about it, if I only treated you a couple of times and then told Old Master Mu that your illness is incurable, he would definitely feel I hadn't put my heart into treating you and would continue to look for other doctors."
"So, you either let me truly cure you."
"If you don't want to accept my treatment, then you need to overcome your psychological issues yourself and lie to them, tell them you're already well, so both you and I can save ourselves the trouble."
"But I estimate that this lie will be seen through, because every time Mu Feng is mentioned, your psychological issues flare up, after all, when you're ill, it's hard for you to control yourself."