1) You can go home and show how miserable you are and how you are lost and empty; how you can't fathom life without her (even though that's all she's offering). You can break down and cry, beg and plead. And it won't make any difference because she's made up her mind (I wonder if OW has something to do with that. If she's a lesbian now, maybe you don't have enough to offer)
2) You can accept that it's over. Does that mean forever? It shouldn't. But you can accept that she truly believes that the best thing for her is divorce (regardless of her reasons) and she'll be happier without you. You can accept that you won't have her sharing your life. But that doesn't mean you can't work to make your own life enjoyable and complete. You can be strong. You can be confident. You can work to be happy with your life. Will it bring her around? You can't control what she does...only what you do, but I think you'll improve your chances. If she chooses not to return, you'll at least be on the path to healing and having a fulfilling life. I know...easier said than done.
In the end, it's not the years in your life that count. It's the life in your years. Abraham Lincoln
It is hard to fail, but it is worse never to have tried to succeed. Theodore Roosevelt
