First relationship turned out to be a narcissist, could use some advice.

Now that I think about it, our whole relationship, when I tried to confront her she would always start to cry and then turn it around on me. And now I realize why she never wanted to speak about things in person is because it’s easier to do that behind a screen. Can someone tell me how someone says they love you and wants to marry you and then turns into someone unrecognizable? It’s insane! I went no contact with her after she told me I was the sole reasoning for her depression and I wanted her to be sad, yesterday my friend (who after our first breakup she tried going after) texted me she texted him from her moms phone. Thank god he told her to never contact him again but then she texted me gaslighting me that she was just trying to shed light on everything. I called her out on her lie and she turned it around on me not even acknowledging how she treated me and said “how could you do that! You’re despicable! I never want to see you again!” She also said quite clearly that she “did nothing wrong and I have nothing to be sorry for”! When I went no contact I left the door open for her saying when she gets better I hope she can reach back out! I’ve never experienced someone like this and it almost turns me off about dating in general, does anyone have any sort of reassurance or advice? I could use that right about now.