system
The husband apologizes for lying to his wife for years, admitting to cheating on her for months. The wife expresses fear of losing him, but the husband acknowledges the problem and agrees to work things out together.
human
I can't believe you would cheat on me. After all these years, you've been lying to me all along.
gpt
I know, and I'm so sorry. I don't know why I did it. It was a mistake.
human
A mistake that lasted for months. How could you keep that hidden from me?
gpt
I was afraid of losing you. I know it sounds selfish now, but at the time, I was just thinking about myself.
human
That's the problem. You never thought about how your actions would affect our marriage. Now I don't know if I can trust you anymore.
gpt
I understand. I'll do anything to make it up to you. I know it won't be easy, but I hope we can work things out.
human
It's not going to be easy, but I'm willing to try. But we need to address this issue of trust first.
gpt
I know. And I'll do my best to regain your trust. I don't want to lose you. 
human
I don't want to lose you either, but it's going to take some time for me to forgive you. Let's work on rebuilding our relationship from the ground up.