Authenticate User Email Via Google Sheets?

Question

I am pulling data from a Google Sheet using the user's email which allows a personal conversation. Works great. But... if the user gives a wrong email address, the workflow continues which causes a lot of issues. I need to have the workflow stop if the email provided does not match the email in the Google Sheet. Attached is my current attempt using Conditional Logic. I am not sure if this is the right approach... or if there is another (right way) way to do this? Thanks!

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Authenticate User Email Via Google Sheets?