I agree with this.
It seems such an odd thing to be starting a thread about, when you believe your Mum may be in the last week of her life. Focus on her, and reconsider your relationship with him when neither of you is in such a difficult place.
Do you have any view though on being engaged being each others family, does that make you closer than your wider family? Do you think your fiance/husband should be your main source of support, especially if you do not have a larger family?
Do you not have friends etc who can support you? I think it's a lot to put on one person to make them your only emotional and practical support
@Medschoolmum is right.
I think most people get different emotional support from different people.
My dh has always been very supportive when needed, but I get a lot of support from my friends too.
In your circumstances, he has a lot going on at the moment, and, no, I wouldn't expect him to come to you.
I am confused about your living arrangements, but, I don't think anyone would expect anyone to fly 7 hours for a funeral - let alone a cousin's partner. I wouldn't expect even a fiancé to fly 7 hours to be there for the last few days of your Mum's life either, in truth.