Seller offers to sell their home to a purchaser for $70,000….

Seller offers to sell their home to a purchaser for $70,000. The purchaser responds that he will buy the home for $60,000. The seller refuses the purchaser’s offer to buy for $60,000. After that refusal, the purchaser offers to buy the home for $70,000. At this time, what is the legal relationship of the parties?