Alex makes an offer to Bob. The offer is initially rejected. Later, Bob changes up and decides to take on the offer, but Alex has taken it off the table. If Bob is the protagonist, this is usually portrayed as being out of spite or Evil Gloating on Alex's part. If Alex is the protagonist, this is usually portrayed as righteous indignation and/or a deserved comeuppance to Bob. Sometimes, as a variation, the offer still stands but with some modifications or a higher cost. Lesson learned, kids: If you refuse a good offer because you expect something better to come along, you may regret it.