Sex work is...work. Having a partner you love is completely separate to that.
Assuming that all sex workers derive pleasure from work will make it seem like he's having his cake and eat it. But here's the truth, fluffers exist for a reason because sex work is having sex with someone you're not necessarily attracted to for the sake of creating the illusion that you are. It is nowhere near the same as being in a relationship and sleeping with the person you love and are deeply attracted to.
Like, I get it, not everyone is built to handle their partner as a sex worker but it has to be remembered that it is work. They do it to get paid. They sleep with people they would never if they weren't doing sex work. They don't get to choose that but what they do get to choose is who they come home to.