too much relationship talk, too much pursuing on your part, too much neediness and insecurity being displayed on your part, too much letting her call the shots ("are we getting a divorce?", you ask the question "we" but only one of you is deciding, do you notice that?)
- let her leave the house, she wants joint custody, that means you'll have the kid half of the time, let her live with the reality of her decisions, stop trying to prove your worth to her, I'm sure I told you that a long time ago, it actually does the opposite and look at the great results you've achieved thus far (I'm kidding, things obviously don't sound too great)
Chin up bro, you can handle this, by getting a handle on you.
Don't turn into a jerk, or a prick or an a$$hole, you're better than that - but you don't have to kiss her a$$ either, have some respect for yourself.