I know why I was sad

I know now what bothered me yesterday.
When he video called me, with no shirt.
I had messaged him about an hour before that, saying I was home, but no response from him for over an hour.
Then, he doesn't want / well can't have sex. Has to go to bed early.
I know he needs it every day.
So logically it means he got it from somewhere else. While I go without.
That makes me sad.