Two people can leave the same conversation with two different agreements and neither of them is lying. Memory reconstructs, emphasis differs, and what was implied gets recorded as stated. A good negotiation ends with a shared written account precisely so that nobody has to rely on recall. It is not distrust; it is an acknowledgment of how memory works.

End important conversations by summarizing what was agreed and confirming it in writing. Keep it short and in ordinary language. Anyone reluctant to confirm in writing is telling you something useful.