It’s common knowledge that listening to a love song right after a break-up is a good way to start the waterworks going, but, as Jennifer Lopez learned to her cost after she ran off stage sobbing, it’s apparently also not the best idea to sing about love, either.  During her headline performance at the Mohegan Sun Arena’s 15th anniversary celebration, Ms. Lopez sang “If You Had My Love,” from her 1999 debut studio album, On the 6.  The singer, who has recently split from husband Marc Anthony, broke down in tears and ran off the stage.  Ah well, all’s fair in love and war, I suppose.  And while I’m not the sort to sit there sympathetically when a star of starlett waxes poetic about the trials of the paparazzi, or how she/he feels so unloved, this one I can sympathize with.  After all, who among us hasn’t gone through a painful breakup?