Noticeably absent from Michael Jackson’s memorial service on July 7? Janet Jackson’s longtime music exec boyfriend, Jermaine Dupri, reports.

And for good reason: “His friends are telling people it’s over,” a source told Us Weekly. Echoed another: “They have been moving in different directions for a while.”

And why did the seven-year relationship end?

“You shouldn’t mix business with pleasure,” a mutual pal explained. (Dupri produced several tracks on Jackson’s last two CDs.) “Janet felt their lives were too crossed and they should have kept things separate.”

And, they were polar opposites: “Jermaine likes to be out there, mingling with everybody, and Janet’s more shy.”