She had mental health issues she acknowledged, but refused to get help for. And these issues just interfered a lot with what a healthy relationship should be, so after a while I had enough and told her what I thought of this.

She got quite angry, which is fair because me being so fed up meant I was being a huge dick about it.

Long story short, we both decided that we never want to hear from each other again.

So yeah, could’ve handled it more maturely.
I genuinely never meant her any harm, and I wish her all the best. But ultimately, us not being together is for the better.