Thank you for the reply. As you can imagine, this topic occupies my thoughts the majority of the time. Not fun!
I don't think there's any way I'd be denied shared custody. I do worry that once we're divorced, my wife will be so hurt that she'll tell my daughter so many negative things about me that my daughter may pull away from me. I have an awesome relationship with my daughter thus far, so I'm hoping my she wouldn't let anything my wife says get in the way of that, but you never know how a child will react to a divorce. Especially since my daughter is so young.
Every day, I dread being around my wife, but every second with my daughter makes me feel so much better. If I ever lost my relationship with my daughter, that would be crushing.
And specifically, when I mentioned losing her for half of her life, that would be the most likely custody arrangement - shared time. So for half of the time, would never see her. I'd still do everything possible to maximize the time I do have with her, I'd talk to her on the phone as much as possible when she's with her mom, and I'd do everything I can to find a much better partner to marry so I can show my daughter an example of a happy and healthy marriage. That may be how I cut my losses and make the best of this bad situation. But it'd still be heartbreaking to go from seeing her every day to only half the time.
I'm counting on someone here to invent a time machine so I can go back and avoid this entire mess!