1, you may take the problem too seriously, and things may not be as serious as you think. At this time, your mother's opinion still has a great influence on you, even affecting your decision-making, which may not be appropriate.
From beginning to end, I didn't hear your analysis or guess that it was beneficial to your husband. I'm afraid this is a preconceived idea. Don't be so hasty, especially now that you have children, you must be careful.
Be sure to make it clear to your husband and listen to the reason why he did it. Death row inmates still have a chance to make a final statement. Even if you can't understand his explanation, at least give him a chance to explain. Maybe he really has something you don't know and it's not convenient for you to know?
4, men sometimes die for face, in the process of "death", may take the wrong behavior.
People will inevitably make some mistakes in their life. We must first tolerate these people, not to mention that this person is your husband. I want to ask, what would you do if this man were your brother? Many children stole money from their families when they were children. I've never heard of parents kicking such children out of the house. The reason is the same, except that you have regarded your husband as an outsider.
In my opinion, your husband's mistake is not enough for divorce. I'm worried that once things are clear, it's your husband who filed for divorce, because he will feel humiliated.