Well, it looks rather like phlox panticulata but I could be wrong. Have you had any flowers off it yet?

Okay Gilli, I'll give you some more info on this plant....the main stems kind of remind me of a willow twig. Each leaf is attached with a reddish leaf stem. Each leaf has very small ridges/teeth.

It seems to grow fairly quickly. What is showing in the picture is about a foot tall and has grown that much in a month. When i planted it last year, it didn't do anything. And I only planted root stems. I have not gotten any flowers off of it yet.

The root stems were packaged as Bleeding Heart...Obviously this isn't a Bleeding Heart bush....

No, obviously not Dicentra.
So the stems are twiggy or woody rather than fleshy as in a herbaceous plant? If that is the case then I can see why you would think 'Willow'. Could it be a willow? It may be a Salix daphnoides or Violet Willow.

I would have said a willow and a weed that self seeded into the pot in the nursery - shouldn't have been sold! It could be a thug.