Wang Haifeng's memory was indeed correct; he had never turned his back on Feng Jun.
But it must be pointed out that this was because Feng Jun had never taken advantage of their friendship to make any excessive demands.
For example, if he had asked Wang Haifeng for money without good reason, Coach Wang wouldn't just turn his back—he might even slap him: I indeed am not short of money, but it is my money, why on earth should I give it to you?
Moreover, this had always been the way Wang Haifeng operated; he didn't mind spending money, but it had to be on his own terms.
Therefore, Feng Jun didn't believe that, just because they were friends, he was obliged to teach the other party the Cultivation Technique—it had to be something he was willing to do.