Do I need to pay more

Hi everyone. I am new to the site, so apologies if this has been asked before.
I have separated from my husband (been together 25 years, married 19), but we are living together but separately, for the time being.
I earn a third of what he does, but he recently said as he now does all his own chores (I refuse to do anything for him as the reason we split is he was cheating on me for months with several women, but before this I did absolutely everything for him for the entirety of our relationship) and pays 70 - 80% of the household bills, that I need to pay more. I have continued to pay the same as i always have and I am wondering if I do need to pay more now, or if what I have always paid is what I should stick with.
I start a second job next week to take me to full time hours, but even then I will still only earn half of what he does.
I pay a third towards the mortgage. I pay the home insurance and road tax for my car. I buy the groceries. We have an 18 year old son who is still financially dependent on us as he is away at university and doesn't have a job, and a dog who need daily medication and expensive food, which he pays for, but I pay for his vet appointments and one-off medications.
I am trying to get set up for when we sell our home so I can get another mortgage. I will have my son and dog living with me, he will only have himself to worry about.
Thank you for reading all of this. I just feel so lost around what I should be doing.

There is no right or wrong answer to this question I'm afraid. However, at some point you will have to run your own household and it sounds like the sooner you're no longer both under the same roof, the better.

If you are living separate lives are you each buying your own groceries, cooking your own meals etc?

Whose dog is it?

Whose name are the utility bills in?

How much more is he expecting you to pay and how much more can you afford with your new income?