Eighth of an Acre Bounty

So this is the post where I expose my ignorance. My plant identification skills suck for the most part. This little green thing above showed up last year in what was originally to be our strawberry bed (poor siting and the strawberries, erm… failed to thrive?). I have no idea what this is and am reluctant to make a command decision on whether it stays or goes until I do know. So the question goes to you, dear readers. Anybody have a clue here? It is a low growing plant that dies back in the winter, puts out these tiny little purple flowers through spring and summer, and generally taunts me for my ignorance every time I look at it. Help!