How to back out of purchase w financing contingency

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Looking for advice from any mortgage professionals.. I need to get out of a purchase contract which is only subject to a financing contingency at this point.  I basically changed my mind due to recent personal life developments.  I have been conditionally approved and provided recent bank statements proving the down payment. Can I notify the lender that I no longer wish to use these monies for the down payment which will make me ineligible for the loan? Or that I plan to quit my job and relocate? Does updated verbal information from the borrower change the loan approval? I need a loan denial letter