What strikes me in your post, is that as soon as you got really sad, all actions were directed to 'modificating' it. Like 'sad' isn't allowed? Like 'sad' had to end, or become less? But you were sad... and maybe just needed someone to sit next to you while you were being sad and hopeless. No more no less.
Dear LJB, I think what you experienced was a temporary rupture. Not a break up. You were sad, maybe you didn't feel validated in that (it had to change) and then you got p'eed off and announced you'd had enough. To me perfectly reasonable and very recognisable. And it hurts and makes you feel hopeless and pointless and possibly mad. I hope you can take some time to scrape yourself together a bit and face this with your T. After a (temporary) rupture often a period of deepened understanding arises.
Hope this doesn't sound too theoretical or even harsh-ish... I just got up and my English isn't all there yet. But my heart is...