It happened on the seventh day, that they said to Samson's wife, Entice your husband, that he may declare to us the riddle, lest we burn you and your father's house with fire: have you called us to impoverish us? is it not [so]?
It was after Samson had paid his debt of 30 garments that the text says he became angry. The object of his wrath here was his "wife," not the Philistines. Samson did not intend to abandon his plan to marry the Timnite (Judges 15:1-2). He went back home to let his anger cool.