What is This Plant?

I bought a plant, just because it was pretty, but have no ideal what it is. The little guy at the nursery said they just came in, and the owner wasn't there and he didn't know what kind it is. But, this is what it looks like:

It is all purple, and each stem has 3 heart shaped leaves, which go in a circle, kind of like a clover. The stems are very fragile, and the three leaves close up and then they look kind of like a butterfly. It is all dark purple. Any suggestions on search would be appreciated and if someone knows exactly what I have, I'd greatly appreciate that! I could take a pic of it if I have too.

By Teresa M