This person that I THOUGHT was a friend...was saying mean?

stuff about me behind my back. A real friend of mine told me....she thought this was slander. and it was. So I called the girl up and said..."Were you talking crap about me at so and sos house?"..She vehemently denied it."...But, when i looked back...I can see her making up stuff about people. I told her at the end of the conversation.."Look I feel you said it because of how you are...jealous of people." Just to let you know.."I forgive you, but do NOT want to be your friend anymore; cuz I thought you were a friend, but you are not."...she just said.."ok"...and we hung up. This is the FIRST time I have been ertive and feel good about it. Any opinions on what you would do???