I tried it with the DDG free version of ChatGPT o4 mini.

It sounds like you're going through a really tough time, and it's understandable to feel sad and alone after such a situation. Cheating can often stem from feelings of neglect or unmet emotional needs, but it can also lead to significant pain and consequences for both you and your wife.

Have you had a chance to talk to her about how you were feeling? Open communication might help both of you understand each other's perspectives better. It’s important to reflect on what led to your actions and how you can address the underlying issues in your relationship. Seeking support from a counselor or therapist could also be beneficial in navigating these feelings and the situation.