House Plant Identication

[denvervet]

I know this is not the website for this but I have been searching on line to identify this houseplant! Can't find a thing at all. Maybe someone out there knows....

Has thick leaves, they have silver tone spots on them, it grows in a vine.

I used to know the name. The person who gave this to me is no longer around to ask. He did say it liked to be root bound to be able to flower. Moved it to a small pot 2 years ago, still no flowers. I must be doing something wrong and need to know the name to do that. You guys have helped me for a few years with my orchids and I've gotten excellent advice, anyone know what this is?