You can withdraw the divorce petition at any time up to when the decree absolute is issued and remain married.
In circumstances like this, if he has not come to his senses even by the time the decree nisi is issued then there is a possibility that it won’t happen.
What you have to decide therefore is whether, in circumstances like that, you want to go ahead with the divorce or not. The issue of the divorce proceedings is likely to push the issue one way or the other.
You would complete form D11 withdraw the petition asking for an order to dismiss the petition in the matter. Your husband would write to the court a plain letter agreeing to the withdrawal.
Incidentally, it’s very difficult to petition for divorce on the grounds of adultery unless your husband admits it or he is caught in the act.
Can I clarify anything else for you?
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The decision is yours. It could go one way or the other. It depends whether the financial aspects are important to him.
What you could do if you wanted to deal with it a bit more softly is get the divorce petition and all the paperwork filled in and show it to him and tell him that unless it stops, that will be going off to the court.