I ended things with her.

I love her so deeply, but something went wrong, it was the only and biggest argument I ever had with her. It wasn't that deep, it was pretty stupid. I wasn't her first boyfriend she's had multiple... about 6 or 7 and I had about the same. We had this argument after she mentioned her ex-boyfriend in a conversation and she said that something I said reminded her of her ex because what I said her ex would say all the time and let me tell you this is the first time I really made her upset about what I said. And when she said I sounded like him it made me mad ngl (since her ex is shitty asf). Knowing what I said to her was wrong and her knowing what she said to me was wrong I still managed to fuck the relationship up by telling her that she's fucked up for saying that. I know she was tryna be nice and say sorry but atm I was fucking pissed. It's not even like her to bring up her ex in a conversation and this was the first, so it confused me as well. She got upset after what I said to her about being fucked up and she said "srs wth" and I kinda responded with "what" knowing it would piss her off and she blew up "yk you're srs an ass for saying that, I apologized and you won't even say sorry, that's how messed up you are?" and I responded with "the only thing that's messed up is you and your family" and I regretted saying that. She didn't say anything, she was texting me but then she stopped. She read the text and disregarded that I said that and said "wow, fuck you" and I said "okay, fuck off, I want nothing to do with this relationship" and she said "you're breaking up with me?" and I said "yea" and all she said was "k" and it's been about a week and holy shit I feel guilty as fuck plus I feel so bad. I feel like the worst person since I treated her so shitty. She didn't deserve that I know but Idk what happened. I still love her like hell and idk how to make shit better, so help?? like asap.