Did you know Haylie Duff was dating Jamie-Lynn Sigler's ex-hubby, A.J. DiScala? Probably not 'cause it's not really important -- or interesting. But after a blink-and-you'll-miss-it month, the relationship is over. (Tear!) "She's the one who broke it off," a source tells Star. "She just wasn't into the relationship."

Hmm, or maybe she's just not into being in a relationship when Hilary's not? 'Cause we all know the girl never does anything alone.