If you don’t have need to contact her, remove her as a contact.
If you have shared responsibilities such as children, update the picture in your contacts and figure out a way to work through the anger and hurt because if you don’t, you’ll end up alienating yourself from them. If you have non-human shared responsibilities, do so for your benefit and that of your future partner(s) - keeping it alive by habitually referring to them derogatorily will just self-condition you to hold onto it and live in your past. I recommend a mental health professional like a licensed therapist but that’s not for everyone.