Am I wrong for not wanting to split my pay with my boyfriend who pays the bills?

My boyfriend pays all the bills but he requires me to save almost all of my money and then whenever things get too overwhelming he uses the money from my savings or when he needs money for emergency I send the money. It's frustrating because IF the situation calls for thousands of dollars in a month I pay it no questions asked but yet I don't get to use hardly ANY of my earned money on myself since I'm required to just save it all. We are expecting a baby so saving seemed like a great idea but it defeats the purpose of saving the majority of my checks if I'm just gonna spend it all on things he can't afford. I went on a spending spree this month and he got mad because I didn't stick to the plan and I told him I find it unfair because he doesn't have to be required to spend every dime on bills but I'm expected to save most of money just to end up using it on bills anyway. He said we should just go 50-50 and I said I was okay with that but then he said the 50-50 he is expecting is for me to give him 50% of my paycheck each week which by my calculations 50% of MY income covers ALL of our bills for the month. I'm debating arguing with him on this because we are a team and I do not mind helping out with bills I actually suggested we split bills from the beginning but splitting MY paychecks down the middle is not splitting bills that would be just me paying the bills. But at the time of suggesting I agreed to split because I felt like that would leave me with money for me rather than saving it all for him to use later on bills that he couldn't afford or that piled up or emergency expenses.

Am I wrong for not wanting to split my pay with my boyfriend who pays the bills?
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