That is rather strange. So, you are saying that your plant is dependant of the tutor and starts falling over when the tutor is removed?
I discoverd that the plant kinda starts degrading after 3 or 4 years and that you should restart it after that amount of time. This plant needs to be watered as soon as the top layer of soil gets dry. It doesn't like to have it's saucer full of water. So, you should empty it after watering the plant.
If your plant is getting all limp or rotting that means that you are watering it too much and you should use a fingucide. Or, you could let it dry out a bit more to stop the rotting and cut the rotted stems.
It also is a very toxic plant. You should wash your hands after handling it.