According to the iTunes page:
Breaking up with someone? There's an app for that.
BreakupText makes it easier than ever to end things with your significant other. No more awkward conversations or phone calls. With BreakupText, you can end your relationship in just a few taps.
This app costs $1, and if it were brilliant I would hope for its creators to experience a financial windfall for their troubles, but it's not and it promotes people to act like dickless wonders so I must urge none of you to buy this and to continue to break chicks' hearts the old fashioned way: over an emoticon-laced E-mail.