I totally understand your anger and disgust. The positive side of filing is that finally you are showing your teeth and sending him the message, Enough is enough, I won't tolerate your lies and your disrespectful behavior anymore. The strong Sara is back.
Did he mention moving out soon?
From what I have witnessed from my friends who went trough that ordeal, buckle your seat belt and get ready for a wild ride when you will start to make demands that won't go his way. Stay calm and handle it as a business deal, think about everything, from what the kids will need now to until college. It's very difficult/almost impossible to change a divorce settlement once it has been signed by a judge. Also you might be entitled to be reimbursed (50%) of the money he might have spend on selfish spendings or the OW. Don't let him intimidated you during the process, keep your mind on the finish line.
Me 52+ WH 57+ Married 20 + Piecing since 2016 (ready to give up...)