I wouldn't call it work because that has a negative connotation but I think relationships require effort. I have three kids, seven pets, an ailing mother with dementia, and almost no time to myself despite being in burnout with chronic fatigue and requiring a huge amount of alone time to recharge. In my case that means I have to make the effort to make time for us to be alone, and time to devote to his needs/interests/trauma/emotional health in addition to my own. It's not a burden and I love our time together but I could easily slip into a pattern where I'm too tired or just don't have the spoons.
He doesn't have kids, he has only one pet (his brother will watch him whenever it's needed), and his parents are both deceased. He doesn't have the same stressors although now he's working part-time so he remembers what it's like to feel burnt out.
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I never give you my number, I only give you my situation.
Beatles