Update:

I found concrete evidence that WW has been lying to me (and kids) about where she has been going almost every weekend - and that it indeed is the OMs house.

Question for vets: Does this change anything for me? Before it was pretty easy for me to ignore her in our house and just play/enjoy my kids but now that I am 100 percent sure she is not only lying but infidelity is involved it is hard for me to not grit my teeth every time I see her. I really would be happier at this point with her out of the house.

Question #2: Can this be used at all in any way legally during the D process? For example, showing pattern of lying to me and kids and infidelity - would that help my case on having to pay Alimony? I know courts dont seem to care about infidelity regarding child custody though.