Crushed,
Welcome to the club that no one wants to join.
I think you've received great advice thus far.
I'd like to add you should be really focusing on going NC with your WW. Read about the 180 in the Healing Library in the yellow box at the upper left of this page.
No more consoling her. That would be rewarding her for atrocious behavior. And it inhibits your ability to emotionally detach. Don't open yourself up to her either. You're only giving her an insight as to where you are emotionally and she may use that to further manipulate you. Hell, her tears are more than likely another way to manipulate you, to get sympathy from you so as to avoid consequences for her choices.
I think you're doing great getting your ducks in a row by contacting an attorney and informing your children. It seems like you know what you want. Being married to a serial cheater is not one of them..
Someone here told me this recently. "She threw you out like yesterday's trash and she's not allowed to use anything of yours ever again. Not your time, your money, your energy, your good nature, nothing."
Repeat that to yourself ad infinitum. Your life will only get better once she's no longer a part of it.
Sending you strength, bro.