Originally Posted by Lvrofbutrflys
I don't want to lose a friend but at the same time I don't need a friend who only uses me when it's convenient for her.
How do I let this go?
I think you have found the answer to your own question. You don't want to lose a friend but she's not a friend if she only uses you when its convenient for her...
Therefore you don't need her so just lose her. You'll get over the feeling of being used, take comfort that you tried to help a fellow human being but she just didn't care. You've done what you could have.