Should I text my ex-best friend?

My ex-best friend and I got into a falling out. While I was dating my ex, she did everything to break us up and then skyped with him for like 10 hours the next day, then they both became a "thing" within two days which then led to them dating like 3 days later. I honestly couldn't care less about my ex, but I care about how she acted in that duration of time. I told her that I didn't know if I still possessed the respect I had for her and that we needed some space for a while. She didn't really act like a best friend and never really considered my feelings and would just blow things off when I had a problem, but tell me that I never tell her anything. I'll admit that I wasn't really happy and she always kinda made me feel like ****, but ever since the "break" I've been quite satisfied. Though true, we both were there when the other went through a rough time in their life, so it's not like our friendship was that unhealthy. Today, she posted on her story on snapchat her (after)crying that today was a bad day. I suddenly felt bad for what I said, and if I'm to blame here, then I take full blame, but should I text her to see if she's alright? I'm afraid she'll take it the wrong way and that I forgive her right away. I feel like if things do turn out well, I could get into another unhealthy friendship with her. I'm just tired of this huge circle-fight, make up, fight, make up. Plz give your honest answer. Thank you for reading. (also please tell me how to give best answer :P ty)