reality check

The earlier you accept reality, the better you will feel later. 狗改不了吃屎，you knew he was a playboy and chose to trust him. As a lawyer, I can only say you took a calculated risk, for which you can blame no one. You gave your best years to him, but are no longer attractive in his eyes. After all, he got used to your body and after two kids...

I would file for sole custody, but not sure you can win. It will be an ugly battle. You married a white trash, nothing more.

Hope you can find peace soon, not necessary another marriage.