It always amazes me how these people become totally unreasonable. Really, like they think that these terrible choices are just going to fall into place and they will live happily ever after. What a rude awakening they are in for.
Onward, I hope that you start having an easier time. I didnt have kids involved, but if my H chose to leave the marriage he was walking away from home as well. I didnt tell him he couldnt stay here, but if I ever caught him communicating with her, I told him that I didnt think he should sleep here tonite. Maybe it just encouraged him to be sneakier, but at least I didnt have to see it. Eventually he stopped coming home at all.
I dont know if it was the "right" thing to do, Im sure that plenty will find fault in it, but it got the lying and disrespect out of my (Our) home.
Again, Im so sorry.
I guess I gave the wrong finger to the wrong man...