Would you say something or let him learn on his own?

Recently my boyfriend and I had a talk (tmi) about him not going down on me. I asked him if there was a reason why and he said because he’s never really done it before. I asked him if he would be willing to try and he said sure. So he’s been doing it for the past two months whenever we have sex but honestly he just doesn’t know how 😫 I feel really bad to say something because then I feel like he will get discouraged and not want to do it anymore. One time he stopped in the middle of it and said “You aren’t feeling it huh?” I lied and said yes I am but I knew he could tell I wa lying 😅 What would you do?