She &amp; I have been together for ten years. We separated two years ago (I left). At first, we kept texting a lot, because it was hard for both of us to end it all of a sudden. But at some point I told her that if we weren't getting back together (she's against it), we should stop it, but she doesn't want either, so she keeps coming back. Honestly it hurts me a lot to keep talking to her. I don't want to remain friends with her, at all. And my new girlfriend wouldn't appreciate me casually texting my ex. I keep telling her that it hurts me and I have to move on and preserve myself and my happiness over being "nice" to her, but in her dream life we keep texting daily while being separated and living new lives. I think that's insane and she tells me that I'm "always choosing for her" and that "social norms shouldn't dictate our behaviour" (wtf). 

So, AITA for severing ties with her ? 

PS : I should add that I can't block her number, we still have to communicate over legal matters for our previous apartment. And I don't feel like blocking her, it would make me sad; I'd rather have her understand by herself. 