Rejection hurts.
At the same time, in my opinion, it's abusive to treat someone as though they do not exist. Your ex-friend is acting in a very hurtful manner, in an ongoing basis. She's treating you as though you are dead or invisible. It's abusive toward you.
Please don't ever give up because of someone else's behavior. You don't deserve to give up! Nor do you deserve the abuse!

WC