Surgery and boyfriend support

Hello !
I finally decided to get the hip surgery I need to get through.
I announced the date of the operation to my boyfriend and he told me that he already arranged a ski tour where he will be leading people in the mountains on this weekend.
I know we should not have a manual but I do expect my boyfriend to be there when I have to undergo a major surgery.
I explained to him why I would require his support but he said he prefers to go ski touring.
For me, it is a deal breaker in a relationship not to be supported in difficult time…
What should I do?