[NSFW] Have you caught a spouse/mate in the act of cheating?

disclaimer No, it was not me. Please answer as to what you would do, not what someone else did. Don’t use names if you will bust someone out and blow their secret (especially if it is another Flutheronian). If you were the one boinking the attached person who was cheating, you do not have to say

How would you handle catching your spouse or partner you thought loved you and you trusted them if you caught them in the very act of cheating? If due to an occurrence on the job they had to close up and send everyone home early. You drive home and notice your partner’s car is home when it should not be. You enter in the house but no one greets you, and you hear noises from the bedroom. You go and open the door and there is your mate/spouse boinking someone you have never seen before. What would your reaction be?

Same scenario but your spouse/mate come jaunting into the kitchen buck naked, and upon seeing you seem flabbergasted. Before any of you speaks the person they were boinking pops into the kitchen telling your spouse/mate not to forget ice for their drink, before noticing you there. How would you handle that?