Me and my oldest friend fell out about 18 months ago, and we haven't spoken since. We're still friends on social media and we have a mutual friend who has told me that she has said she would be willing to rebuild the friendship, but only if I contact her first. I do miss parts of her friendship, but she seems to have moved on a lot with other friendships and I've since moved to another area. Should I send her a message after all of this time? If so, what should I say? 