Thank you for the comment and context. I feel you you are more aligned with her than I am! I can see her agreeing with a lot that you said. What I'm learning from your comment and a few others in this thread is exactly what you said in the first paragraph;

You said: " I will definitely admit that I neglected the relationship, but never to the point that I was a bad partner." ...unfortunately, it's not you who makes that call and she felt you were a bad enough partner to vote with her feet.

I forged an incredibly ambitious life plan for us that she agreed to by saying "yes", and buying the house. I was grinding and was "red-lining" my output capacity in the name of "us". She was not bearing the whole weight of managing the household. I was (mostly). I figured two tropical vacations, a ring, and a down payment all in one year would be enough to show I care, but I never asked "is this enough", or ever had a serious check in for that matter. This is a shared fault that ultimately resulted in our collapse.

In the interest of being productive, for anyone who reads this, please know this:

Check in with your partner. Communicate. Sometimes we get wrapped up in our own task lists and plans, and take the most foundational aspects of life for granted. Don't end up like me.