Advice?

So my ex texted me today... Say hi, see how I was. I'm not sure if I want to text back or not. See, if you recall, the last time we really talked (in our efforts to be friends), she berated me for wanting a simpler life; called the decision "disgusting." I was ready to write her off write then and there, but then a routine test showed a black mass on her ovary, and I figured I should stay around for moral support should it be the worst. THAT situation ended with her texting me that she was fine; when I asked what it was, I got no answer. And that was the last time we had talked at all. That was 2-3 weeks ago. I figured that things weren't really okay, but that she didn't feel like sharing, and after the tongue-lashing I'd received, I had no interest in probing either. So now I don't know if I want to resume any kind of conversation at all. I mean, our brief relationship consisted of mostly okay times with the occasional my-being-yelled-at because I expressed an opinion she disagreed with. I don't really want that anymore, but I don't want to be ignorant either. (Ma always said I was too nice.) Do I just text her and say that I don't want to talk to her anymore? Do I say why? Do I try to keep things cordial, but just not hang out anymore? Do I just not answer? I don't know... I don't like to hurt people, but I have no real desire to put myself in a situation to feel attacked again either. Suggestions would be welcome.