Help...

So last night my best friend and I fell out. This is all because two months prior they fell out with my other best friend Eleanor. Eleanor and I are still best friends, though they did not know until last night. My best friend Hannah flipped out at me and started calling me a snake and saying she couldn't trust me anymore because I was saying I wasn't friends with Eleanor.  After mountains of apologies she said that her and I are: "chill" I have no idea what that means. I understand that what I did was horrible and I feel immensely guilty for what I have done. How do I rekindle our friendship back to what is was?