Craziest person you ever dated? Not met but dated.

Probably the girl I dated for 2 years after my ex-wife and I separated. We dated 2018-2020 and broke up right before Covid started. She was very emotionally unstable and had a lot of maturity issues as well. She was 12 years younger than me. I thought we had some solid common interests and that she could grow but I was wrong. I did a lot for her but she didn’t appreciate any of it in the end. She was the kind where if she felt any bit bad about anything (which she did a lot) then it was always someone else’s fault, and whoever’s fault it is was instantly a globally bad person and anything good about them no longer existed.