Tell the complete relevant truth
State what you said, what was true, how long the lie continued, and any practical health, money, or relationship consequence. A staged confession turns one breach into several.
Center their lost choice
Acknowledge the decisions they made using false information. Answer reasonable factual questions without demanding comfort, forgiveness, or a promise to stay.
Make safety and repair concrete
Correct records, return money, arrange appropriate health testing, or change access where relevant. Then respect the space or separation they choose.