There are too many such things these days. Does your husband know that you know that he is having an affair? Are you clear? You still think you should talk. If he is a responsible man, if he still wants this family, he will break up with that woman. But if we have made it clear now, but your husband still goes his own way, I think he has lost confidence in your's marriage. Then you have to find the reason from yourself. Why is this happening? That's because your work there is not good enough. Without children, the problem may be relatively simple. I have children too. I can teach you a trick about that kind of mood, but it may not be applicable to both of you if you want to master the temperature. Men are selfish. If you find that you are different from others, you will pay special attention to you. For example, you love beauty more than before, and you have more entertainment than before. There are often strange men calling you, so that he can feel it anyway. But don't go too far. You should go home normally when it's time to go home, but it can also be later than usual. Try to let your child take care of him and let him feel your life. He will feel uncomfortable when he finds out your change. Men are all the same, selfish, especially for feelings. At this time, he will think about how to make you notice him. Don't agree at once, but don't disagree either. First, be cold. Then find a chance for your husband to talk to that woman. If it doesn't happen again, it should be all right.
Above, for reference only, I hope I can help you.