Well, Sluu, you really don't need to tell them why you will not be returning to college. Just tell them you will be going somewhere else. When they ask why (and they will) just tell them you can't talk about it right now. If they are true friends they will be curious but they will not push you for a reason. Once you get settled and feeling better you can tell them the details if you want. They may still be there to support you even though they don't know the whole story.