You must receive independent legal advice from a legal practitioner who does not act for the other party which means that you both can’t use the same lawyer.
This ensures that your legal practitioner will act in your best interests, and is unaffected by any competing or conflicting interests of your partner.
You should be able to safely and freely discuss your situation with your lawyer, knowing that any communications you have, will remain strictly confidential. See the article Should my Family Lawyer finalise my Financial Agreement?