How do I let this girl know IDGAF about her or her feelings?

[Anonymous]

My ex BFF hurt me now she wants to be friends again so she came back bout a month ago and she was texting me and I was being real short with her. I put this in the group chat
media-cache-ak0.pinimg.com/.../...ef529b4b1c63.jpg
And I was feeling kinda salty about it. Cause it was directed towards her so I started being nice now she's texting me and I'm ignoring them and she sent me a few snapchats. How can I let her know IDGAF about her no more.
I hate to be the person who won't let anything go but damn she hurt me pretty bad.

Updates

+1 y

How should I say it. ?

[existing_not_living]

Just tell her through a text. It sounds like a Taylor Swift and Joe Jonas break-up, but at least it gets the job done. Haha :)

[existing_not_living]

Thanks for MHO! I hope everything works/worked out. :)

[Asker]

Np. And yeah but I find myself talking to her

[Anonymous]

What's IDGAF?

[Asker]

Seriously. ? I don't give a fuck

[Opinion Owner]

Ohhh you youngin's of under 18 ;). I'm 25 silly. By my age we actually spell words out :)

[Asker]

O lol what do u think I should do

[Opinion Owner]

Just tell her you can't handle what happened and that you two need to part ways