Cmon vets Im in desperate need of some advice here !!!

I just discovered that my WAW REAL plan is to move in with hr abusive ex, someone that she hasnt had a relationship with in 15 years ! I was told this by my daughter and confirmed it by driving past his place , less then an hour after my Wife dropped the kids off , to see my truck that she's driving in his driveway. Im keeping this under my hat for now, despite the fact that I SOOOOOOOO badly want to let her know I KNOW what is going on. Suffice to say she has done a masterful job of lying to me , close friends and family , having convinced all of them that she was moving into her own place while we resolve our relationship issues.

I KNOW that if I go for custody it will TOTALLY DESTROY any possibility of reconciliation at least for many years. But I'll be damned if Im going to sit by and let her take my kids (almost 6 and 7 mos) to live with a guy with a past history of abuse and numerour arrests for domestic violence. Even her own sister will hit the freakin roof when she hears about this.

I have found out that Im in a somewhat stronger position, given that she moved out and left me with the kids , making it harder for her to argue Im "unfit ". Im already reaching out to family to establish a solid support network for when I go back to school/work in June and I know I'll have the kids with me at least until the end of the school year, so I still have