@nick42b You wrote:she felt we had “grown too close to each other”. Either she didn’t want a long term relationship or she felt smothered by the closeness. Neither of those is a good sign.. If it was the latter, you can change the way you interact with her.
Another possible contentious issue might be that she helped you through a lot. She helped you with what problem?? This might be important. She might have felt more like helper than an equal..
What are your ages and what exactly are pissing matches?? Why did you have pissing matches and what were they about??