I broke everything and I don’t feel any better. How do I navigate my feelings about my relationship? [31/M] [36/F]

Basically title. I’ve been together with her for a year and half and things have been shaky to say the least.

I have written previous posts here about how I have been fed up with my relationship and how I’m not looking forward to the future.

I ended up talking to my gf about it and I felt like I broke her. She’s no longer feeling secure (for good reason) and she’s very unhappy as well.

It started making me question whether I was right about my decision or not. And how is this sustainable for long term?

I remember feeling the way that I do, that I hate all the times she gets mad at me for something and the fact that all I do is just change for her. But somehow I felt like deep down, I questioned why I bothered doing any of it. Why would I put up moving away and having a miserable commute to work every day? Why am I upset about something we fought over every month? Was I even right to feel the way that I do? Was it even worth it for me? We haven’t even had sex for 5-6 months.

And yet I feel like the bad guy here and that I broke everything. I don’t know how to navigate any of these feelings or my relationship and I genuinely need someone to give me some advice.

Idk even what to think or how to handle the relationship.

TLDR; I wrote multiple posts about being fed up about my relationship and how often we fight and how I questioned why I even changed my work schedule, consider moving away and have a miserable commute, or always put up with cleaning up after we fight. But after we talked, I broke her and she’s a shell of how she used to be. And now I questioned if I were even right to feel the way that I do.