My (27F) fiance (33M) called me an "unsympathetic, self righteous, bitch" to my brother (22M). How do i respond?

If we have made plans to see his mum or his sister or something on his side. That day is aside for that. I don't rush him. He had the option to make the osteopath appointment an hour later but chose not to, so he could get home for the football. And no. I didn't call him out on it. Again. I said I have provided this here for context. Is being hungover as an excuse on several occasions, despite knowing in advance what you have the next day, genuine? Is pressuring me to phone his mum once a week, and being told that if I can't do that, that, how much I am letting him down. That if he goes to see his mum, on the rare occasion that I'm not there too, that I get told how much she would've liked me there, that she was asking after me, asking when she'll see me. I'm not baffled by him being mad. I said that I understand. I'm baffled by the bitterness. I'm baffled by the line that was crossed. That inspire of everything, the context of everything. That whether a half hearted apology in your eyes or not, he was the one who decided to take it to the place he did. If that makes me self-righteous or a stubborn mule, so fucking be it.

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