What should I do?

Good day ladies, I have a boyfriend who means the world to me, I mean anything I need he helps and I also do the same in return and he’s an awesome guy to my son even though he’s not his. The problem that I have with him is with sex.......when he goes down on me, I mean he can make me orgasm so hard that I don’t have to have sex but when it comes to his stroke game, I can’t get pleasured. I really don’t wanna tell him because I don’t want him feel bad or heartbroken but his dick is really small sigh😔 I really love him and I don’t wanna leave him just because of the sex situation, can anyone give me some suggestions please....