Taylor Swift -- I Want Calvin Harris Close at Billboard Awards ... Just Not that Close

Taylor Swift's playing the old music game -- make your fans think you're single, 'cause it's good for business -- and that may be why she'll sit 2 seats away from her boo at Sunday's Billboard Music Awards.

Taylor and Calvin Harris have been seen together in public showing lots of affection, but we're told Taylor requested that several of her friends form a human barrier between her and the famous DJ.

Apparently she wants to have interaction without reaction.