Bank Account Boudaries?

31 and dealing with controlling parents. Got screamed at over text for paying off student loans and not consulting my Mom, then got an “I love you, and you are my world” an hour later. My brother and I have some extra assets, and we value opinions with those, but I hate that Mom has access to personal account. I’m tired of it. Boyfriend almost ready to propose but not quite there, this would offer protection and allow me to have private personal account with him. Mom can then still see the second account. Didn’t mention the banning but found myself getting snippy with my parents over the phone last night. Any other advice? This is draining thank you.
Bank Account Boudaries?
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