それは言わない約束でしょ。
We agreed not to bring that up, remember?
✦ AI pragmatic read · suggests Casual
A colloquial reminder between peers, implying a shared understanding and mild reproach; the speaker uses informal でしょ to stress familiarity and expectation that the listener keeps the promise.
A starting point, not the final word — open the entry to add your own note if you'd explain it differently.