I have a Christmas Cactus that I've owned for several years (probably about 15 or so). It's never grown more branches. For the first time, I finally got around to re-potting it about a year ago.(yes, I'm a horrible gardener, plants fear my name) It must have liked it, because I got blooms on it for the first time in a few years.

Anyway, since the re-potting, there is one branch that has continued to shrivel up, I'm assuming I accidentally snapped it off the main branch (and root system). What can I do for it? Is it too late? (It's hard for me to throw out plants. It's like I'm throwing away a friend). Is this a plant that could be 'planted' in water to establish roots? Please help!!