The Echeveria behind it doesn't look good either. The problem is that we can't tell from a photo whether its too much or too little moisture. Its a photo of a point in time without any references. The problem is that overwatering and under watering look exactly alike as they both have the same result: dead roots.
So let us know what kind of care and light you are providing. Do you water when the soil feels dry or every Monday (or whatever day of the week)? When is the last time you watered? What kind of soil is it in? Is there a drain hole in your pot?
What direction does the window face? Is it an unobstructed view of the sun?
