Many of us have unfortunatley expreiced the pain of marital and dating finances.
Joint Banking Accounts: Once you allow a signator on your account, men or women, you provide access to your funds. If you are married, the spouse can clean out your accounts and leave you pennyless. This has occured several times to frineds of mine over the years. Legally they are entiled to the money if you are married in a Joint account.
Do NOT share passwords or PIN numbers.
Place restrictions on spending limits and account administration of the accounts.
Obtain seperate bank accounts.
A few suggestions to save you a great deal of heartache and legal fees.