I've been through the same. The good times were magical but the bad times were utter shite. I was too afraid to leave and, honestly, I wish I left sooner. I could name many significant events of when I just should have went "yeah I'm done bye" and took the damage. I was shocked at the disrespect I had for myself than what disrespect my ex had for me. Shocking, isn't it? My ex cheated, lied, begged me to allow him to sleep with other women over how lonely he was, and I was no where near his top priority yet I allowed him to do those things and kept thinking "itll be okay. Let's just talk it through". He was a good person, just young and didnt want to committ. He was no way an abuser but just had a lack of understanding for strong, committal relationships. I still regret how I was so forgiving but I have better now.

I characterize as this: if you keep thinking of how unhappy you are and often think about what life is without them, then you should breakup. This is especially for if you have done everything to fix the relationship but it proves to be a dead horse. My ex left me eventually about being unhappy. I finally got to think for myself and realized I was dreadfully unhappy. I was devastated for a short time and realized that I was free, I could sleep better, my anxiety was halved, and I met someone better for me. I have been happier ever since and trying to go back to therapy to further improve myself.

I suggest to end it. It's definitely going to hurt for a while. But the both of you seemed to be checked out and beyond repair from how you explain it.