I was going to put this in a PM but I’m posting it here in case there are other people in similar situations that might benefit from some practical advice.
If you want to put yourself in the most favorable position possible, you need to stop thinking of divorce as a single event and start treating it like a process you prepare for.
-I know you had a lawyer previously so I would suggest, if they were good, that you reach out and retain them again. Ideally, your lawyer needs to be experienced with high-conflict custody, military divorces, and mental health issues. Preparation before filing matters more than anything you do after.
-Document everything. Affairs, broken no-contact, manipulation, instability, any self-harm or suicide attempts on her part, and especially the incident where your child was harmed by OM. Courts care about patterns. Keep dates, screenshots, and restraining orders. Stick with the facts.
-Child safety is leverage. A third party assaulting your child while in her care is not something that the court can easily overlook, especially since she continued her relationship with this man after learning about the abuse. It goes directly to judgment and custody. Future partners are a legitimate concern, and courts can impose restrictions.
- Custody drives child support, housing, leverage, and long-term financial exposure. Aim for at least 50/50, with right of first refusal, paramour clauses, and limits on overnight guests. While it’s true that "morality clauses" are notoriously hard to enforce, having them in place in a divorce decree will give you a legal mechanism by which you can establish boundaries for your kids.
-Her being SAHM doesn’t automatically mean you’re doomed to eat nothing but ramen for the rest of your life. Yes, there may be support. But duration, imputed income, custody split, etc, all matter. A good attorney can push for rehabilitative rather than permanent support.
And even if it does cost you a fortune, the amount is known, fixed, and finite. There is literally no limit to what she can cost you while you remain married to her.
-Get yourself stable and boring. Make sure that you’re in IC, present a calm demeanor, and don’t let her bait you into participating in ugly fights with her. Go gray rock with her. Be the parent that is consistent and predictable.
-Stop protecting her from consequences. Minimizing, covering, or "keeping the peace" weakens your case and increases risk to your kids.
Bottom line: staying doesn’t actually protect your children… it just delays consequences and leaves you without enforceable boundaries. Preparation, documentation, and custody-focused strategy are what will keep you from getting destroyed, not hoping things settle down.
It may take a while to get yourself in a place where you can pull the trigger, but you were motivated and resourceful enough to plan your exit before and you can do it again.