As others have said, separation / divorce requires SEPARATE bank accounts. There is ZERO need to share an account for support.
When I was divorced from XWW, I asked her for her account info and then set up a direct deposit with my employer to send money straight into her account.
With STBXWW, I expect to do the same. As a side note, due to XWW antics during divorce, STBXWW and I have never shared ANY accounts.