LH often says something that I completely agree with with.
The fastest way to get your WAS back is a straight line in the opposite direction. (LH - correct me if I said it wrong).
Your H needs to feel like he is going to lose you. Did you notice how when you walked upstairs he came after you? This is what you want, but on a much larger scale.
If you really want the best chance to knock some sense into him, the next time he mentions divorce respond with this (But only if you can actually follow through with it).
Husband: I think we need to move forward with a divorce.
Artemis: You know, I've been thinking about that and I agree. I'll make an appointment to meet with an attorney to figure out how the process works.
Then you actually go meet with an attorney and get your ducks in a row.
Meanwhile, you start acting like you have had an epiphany that your life is going to be awesome now that you don't have to deal with a lying, selfish, cheating spouse anymore. Don't overcompensate and act over the top, you want to appear content and at peace. Almost like you have a glow about you. You respond in a friendly way when he talks to you but you don't initiate convos with him or do things with him anymore. You start going out with friends, working out, taking your son to cool places etc.
All of that ^^^^ is very attractive to a WAS.
Here's the kicker... at first, he's not going to believe any of this. He will try to call your bluff, maybe even try to make you jealous by rubbing another affair in your face. But you continue to act contect and relaxed, he's no longer your concern. It's critical you carry on like this for months until you actually do become this way.
It's a win/win because it will either get your WAS back, or you will be well on your way to healing and detachment and truly prepared to move on with your life.
It's not easy. But neither is this push/pull, sit back and watch him cheat on you approach.
