Divorce Source: Is it over or what ? (the whole story)

Whether or not I get any responses to this, It feels good to get it off my chest.
We were married for 5 years.
Last September, my wife and I had a big blowout. We've always got along, and said that our relationship was untouchable, but she started crying, and told me that my snoring was beginning to affect our marriage. In October, I had surgery to stop snoring, and it worked. My wife said it was completely cured. In November, she told me that she wanted to have breast augmentation surgery, and said it should help her confidence. Then she signed up and went to therapy...because she said she was having trouble handling the death of her father. I asked if she wanted me to attend with her, and she said that this was "her problem". She went to therapy for 2 months, and when January rolled around, she stopped.
She started coming home later, and said she had to start working on Saturday. In February, I caught her looking for an apartment on the internet.
I confronted her, and asked why she wanted to leave. She said she feels tied to the house, and needed to have more friends. I've always encouraged her to keep her friends, but she said that since I travel a couple days a week, that there was never enough time. On February 13th, she started acting strange, cleaning out her car...(she never did that in 5 years, I always did)...And then on February 14th, she didn't go to work, and told me she did. When I told her I knew she didn't, she said she took the day off and went to her fathers grave.

Now, I'm not an idiot, so I told her that I wanted to stay overnight at my brothers, and think about this whole thing. My brother and I talked all night, and I decided that she was definitely cheating. I went back and told her our marriage was over, and she said "ok", as if it were no big deal.
The next day, after more thought... I decided that I wanted to try again, and when I called her, she said it was too late... That when I told her it was over, she accepted it.
She got an apartment a month later, and moved with my little girl. Her boss is who I believe she was cheating with, and he provided her money for the apartment, gave her a raise, and hired a lawyer. He is married with kids.
(he is a millionaire).

She took me to court for child support, and pretends that we are civil about this whole thing, and sometimes acts as if "after some time" we might work this out.
That is not her personality at all. She was never like that, she is going through a rebellious stage, and I'm trying to sort out whether it's just a stage she is going through, or if this is going to be her new personality.
Ideally, I would love to work this out, so that my daughter could be raised by her parents, and my wife could heal and move on.
Am I being stupid ? Should I just file for divorce, and move on ?
I think I know the answer, but maybe someone out here has a similar story that already knows the ending.

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Keep the relationship problems away from the kids

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