Boyfriend not moaning

My boyfriend and I have recently started having sex. He has cum almost every time we do. I have started to make little moaning sounds (I used to never make noise from clit stimulation/fingering). He got used to my facial expressions and body movements to be able to tell when I do orgasm, before we had sex.

However, my boyfriend doesn’t make any noise during sex. He also always has a blank look on his face when he cums.

Is this normal? Should I be worried?

Any advice is appreciated. Thanks!