Certified GKH Gardening Expert
It sounds like your plant has just completed it's blooming cycle.
The flower will fade after several weeks or longer.
Though this plant is a one time bloomer they are not done yet!
At the base of the dying plant you will find a 'pup'.
Carefully cut away the dying mother plant to allow more light to get to the replacement pup.
Your new plant will eventually fill the pot and with the right care and light conditions the new plant will flower.