Seller changing mind...can he once it's open at title?

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Hello,

So we have a seller who we have been dealing with for a couple months on his set of properties. There were issues with the original deeds not having the mete description on them, which took an additional 2 weeks for the title companies to figure out. We are all set to close (HUD statement prepared and created) and now the seller doesn't know if he wants to close or not because our original contract with him expired on April 4th. Can he do that since everything is all set at title and HUD prepared?