and than suddenly, something gave out inside me. I lost the will to fight for it. I told her to do what she wants. It's been 6 months of being stomped on and I just hit a point where I couldn't take it anymore. I'm going to go out of town to visit my parents for 3 weeks, and after that I have a business trip. I told her that when I get back in a month we could talk about division of stuff and our son. But I just can't do it anymore.
I remember this feeling myself. It felt awesome! It's the moment that you take back control of your own fate. You don't know it yet but it's a very important day in your life, make it stick. Never allow other people to rule your fate. BTW, when they truly see you're done and couldn't care less about them, that's when they'll come back around and want you back. Trust me. I say this because you don't want to address that without a well thought out plan. Too many get sucked right back in that way and end up back where they were.
If she comes crawling back because you no longer want her you have to decide what you want at that point. If you still want her then there has to be very firm rules/boundaries/requirements all set forth by you that she has to live up to. Otherwise you walk away a happy person looking forward to your future.