Gosh this has made me cross and I really, really hope you can get it sorted, OP, and not just by you giving up and 'letting' him control all the money, so he can 'treat' you to things. I grew up with an earning parent and a SATP, they were happy but i could see it was not for me. It has left me , though, with a desperate need to be in charge of my own money as that is the prized position in the household.
It's very telling that he is insisting on having the same period of time when he is in a position to be generous as you were before and nothing about the actual sums involved.
^ is the gist of my post, the rest is a wander down memory lane for me. Hope you find what works.
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So I sort of understand where you partner is coming from but oh dear, he has a very faulty idea of what is fair. If he really was on board with the idea of a baby, as i am sure you were between you, you need a new definition of fair, which includes all that you are sacrificing (salary, future promotion and career opportunities as well as sleep, substituting the mind numbingly boring round of childcare and housework) in order to give your child the best chance in life and to enable his career to continue as before.
I have a feeling though, that deep down, it comes down to the fact that he prefers to keep the control over the money in his own hands, so he can be 'generous' with you. He may have hated the days when you had more ( the way he didn't ask you for help when he needed it is a straw in the wind). If you could find a way to unpick these feelings with him, with some professional help, then it will be much easier to find a way forward that you both find fair. Currently, he is clawed his way up above you and is giving no sign of willingness to relinquish this position.
It's very telling that he is asking for the same period of time when he is in the position to be generous to you as you were before and nothing about the actual sums involved.
In my first serious relationship, we started as students, he had much more money than me and i was happy for him to spend it on me, leaving all the decisions (hence control) to him. We always knew that when i finally qualified, i would have loads more so there was no trouble about fairness now meanwhile.
When i did get that job, it all changed but, not, as i expected, for the better as we were both earning comfortably. We argued about 'everything'. Suddenly instead of it being finally my turn to be involved in decisions, i was supposed to 'let' him make decisions so he didn't feel emasculated. I laughed in the faces of the first 'friends' who pointed this out to me, i was sure we were an equal partnership and wasn't i now really pulling my weight in earning too?
All about control.. I had learned that the earning parent had 'proper' this is the way its going to be power and the SAHP had 'make him his favourite meal and wait for a good moment to ask him' power. It's taken me a while to find a different kind of relationship and to relax into (sometimes) not being in control. I still sometimes wish i could 'just decide' things but on the whole our partnership makes me happier than being alone.