"And Esau ran to meet him, and embraced him, and fell upon his neck and kissed him, and they wept." In the plain Torah text, this is a moment of pure reconciliation. Targum Pseudo-Jonathan preserves a more complicated rabbinic reading (Genesis 33:4).
Why were they weeping? The Targum answers with an almost medical detail. "Esau wept on account of the pain of his teeth, which were shaken; but Jacob wept because of the pain of his neck."
The kiss that was a bite
The rabbis reading this passage in late antiquity saw in Esau's kiss not pure love, but an attempt to bite. Esau lunged for Jacob's neck with his teeth — and in some versions, his teeth miraculously turned soft, or became wax, or simply shattered against Jacob's skin, which had become like stone. Hence Esau's sore teeth and Jacob's sore neck.
This is a harder reading than the simple kiss-and-make-up, and many later Jewish thinkers preferred the surface meaning. But the Targum preserves the tradition that not all reconciliation is total. Two brothers can embrace in public and still be calculating in private. Esau's love was real; so was his hunger.
The takeaway: when someone who hated you embraces you, the Torah says receive the embrace — but do not mistake it for the end of the story.