The promise heard carefully can differ from the promise offered casually.

Words leave one person lightly and land on another with weight. A remark like we should do that sometime costs nothing to say and can be filed by the listener as an arrangement. Neither party is lying. They are using the same sentence at different densities. Most disappointment between decent people begins in that gap rather than in bad faith.

When you make an offer this week, say what you mean by it, a real plan or a friendly thought. When you receive one, it is entirely fine to ask whether you should hold the date.