My mortgage contract has expired?

I was buying a house, but the contract I signed with the seller has expired, I was suppose to get a mortgage deal 2 months ago but it was not finalized after 2 months later, but my contract has already expired but we are about to close the deal tomorrow. I feel like I'm being robbed because I got a very bad mortgage deal, but I put a $65,000 down payment, if I refuse to buy the house, will I lose my down payment? Even tho the contract has expired?

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