As you are cooking anyway, it makes no extra work at all unless you count having to peel an extra potato as work?
And what do you mean by saying you, "have to dine"? Are you having to arrange a tablescape on a 20 foot mahogany table? What a lot of airs and graces you give yourself in an effort to portray yourself as poor little orphan Annie.
And how are you entertaining her?
Sticking a feather up your arse and stilt walking?
Shooting balls out of your fanny, a la Phoenix Nights?
Making notes on War and Peace in order to discuss it with her in great depth?
OR
Chatting to her.
You sound like a mean hearted little person and I imagine that your husband is now seeing this for himself, so I shouldn't worry-you'll soon be serving up a dinner for one and entertaining yourself by gimping away yourself to on the sofa.
If you don't think he isn't noticing your compressed little walnut heart, then you are a muppet.
One day, your mum might be widowed and I hope he takes the same attitude as you have done, although I imagine you will have seen his heels long before that happens.
Peel an extra spud-or make him peel the extra spud- and talk to the woman.