Time for action on your part. If a woman is gone, she's gone but very few of them actually will call it quits. However, although she won't say it's over, all her little tiny daily actions say it is. Sorry.
If you takes the steps to officially end it, she will either agree to the divorce or come to her senses because you created the harsh reality of what is going on.
Don't spend each day wondering when things will get better like I did. Life has thrown you a curve ball. Catch it and throw it back. She probably no longer cares about how you feel, what you want, or your needs in spite of what she says...
If you behaved badly in the marriage, repair those things for your next relationship...when a marriage fails your world is turned upside down, but it is a great time to really, really take a look at your own behavior (probably for the first time in your life) and it's contribution to the relationship's failure and vow to rid yourself of those items.
Most likely, as she developed other interests you "simultaneously" developed issues that she clearly pointed out to you over and over again that you never knew you had until she was in love with someone else. That's why this is all so disorienting!