She thinks he's taking the mick a bit as she says u already work 5 days a wk same as him&do all the housework&cooking!
You don't though OP.
If we define housework and cooking as work then you still don't work the same hours as him, nowhere near unless you're cleaning an extraordinarily large house top to bottom each day needlessly.
I wouldn't say this if you had sole care of an infant daily of course, as that's absolutely a full time job.
But you have a teenager and work 15 hours a week.
How many hours a day do you think you're spending cleaning and cooking?
It can't be equal to his working hours, so 5 hours of cleaning and cooking a day, that would be absolutely barmy. So it won't be close to that much.
So it's fair of him to feel it's a reasonable request for you to up your hours.
To be honest&I have told him this,I dread it when dd leaves home&it's just the 2 of us! There's not much conversation most days&he never wants to do anything together just us.
We have holidays etc but he wouldn't dream of having a weekend together just us or anything like that.Ive suggested having a date nite once a month but he's not interested.
This is such an unhealthy dynamic for a 14 year old to be living with. She's learning that this is what a relationship looks like. That it's a normal and healthy relationship.
If you don't want her to end up replicating it as an adult, all the more reason for the two of you (your DH and you, not her and you) to have a serious talk about not just work but your future.
Better to see unhappy parents single and thriving than miserable with each other and resentful.
Can you see how damaging it is for a child growing up thinking this is a normal relationship dynamic?