Wonderful answer there from troll-b1. You always get drunken trash on sites like this.
The situation is complex, and a divorcing woman can be very bitter. You can go from (apparent) love to hatred in mere days. You really need a solicitor. Good advice is not to fight, but to concentrate on children and money, in that order. Don't waste any paper and legal fees slagging each other off. Morality doesn't enter into it. The situation is that 50% of a relationship wants out, blame won't achieve a better "settlement" or help the desperate unhappiness that is felt for years.
Best of luck, you WILL come through it.