Using something you never brought up with given time to (and instead let faster inside to the point of rage) against someone during a disagreement where they're bringing up something bad that you did is refusing accountability and just straight up not okay. So you mean to tell me that you expect the other person to always apologize, take accountability with change, accept their wrong doings and do better, but in the same breath not apologize for what you did, not acknowledge your wrong actions and also take accountability with change? Wild take, man. Go to therapy and learn better emotional intelligence instead of this self-serving leech mentality. Because people like this are just emotional leeches. They want you to be the responsible one who is always the bigger person when it comes to "talking things out", but refuse to acknowledge and learn from their own mistakes. They want you to be there for them, but not the other way around. They will drain you.
This is also why I've gotten to the point in my life where I either play nice (for safety or survival purposes if it causes for it) then ghost or I don't say anything at all and ghost. I have no desire and no patience left to try teaching grown adults how to be good people. If you don't have a conscious where these thoughts occur to you on your own and you have no problem with it, then stay away from me or I'll remove myself for you.