Is it fair that my boyfriend expects me to pay half for all bills, mortgage etc when he earns almost double what I do?

For context boyfriend earns almost 2x my salary, has 10x the amount of savings I do. He still expects me to go halves on everything, mortgage and bills and even expects me to pay when we go out for food/cafes.
- We have been together almost 6 years - lived together 2 and shared a mortgage for 1. We also have a cat (which I paid the adoption fee for).

Just think it’s unfair, I work hard and am struggling to save with the cost of living etc. am I being unreasonable?

Is it fair that my boyfriend expects me to pay half for all bills, mortgage etc when he earns almost double what I do?
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