Zeedman
Garden Master
A photo would be really helpful. From the description, though, it could be a wild bean of some kind. Although we don't know the climate of the poster, it seems odd that it over-wintered - especially if no seeds were formed last year. It may have come up from a tuber formed last year... gently digging around the roots may provide more info. The reluctance to flower seems to indicate that the bean (if it is a bean) is tropical in origin, and photo-period sensitive. I say "if it is a bean" because some non-leguminous plants are called "beans" (such as clove bean), and the leaf description sounds questionable.