Floyd Mayweather 'cheats' on Shantel Jackson, engagement off? Boxer spotted with new sexy 'girlfriend' at LA Lakers game [PHOTOS]

Apparently, Floyd Mayweather's engagement to on-and-off again girlfriend Shantel Jackson is officially over. The undefeated world champion boxer just can't settle down with one leading lady, and it's ruining his chances of ever starting a family.

The infamous gossip webloid MediaTakeOut.com reports that Jackson actually broke-up with Mayweather a few months ago. She wanted the 36-year-old fighter to be "100% faithful" in the realtonship, and that just wasn't happening.

Alleged insiders claim that Mayweather wants to keep his romantic relationships open (aka, hook-up with as many women as he pleases).

In fact, Mayweather even offered Jackson an ultimatum. He'd marry her (and not even require a pre-nup) if she'd allow him to carry-out these "flings" with other side-chicks. But Jackson wasn't hearing it, so she dumped him.

But the stunning aspiring actress is still "in love" with Mayweather, so she's willing to take him back... as long as he agrees to remain monogamous.

But it doesn't look like that's happening any time soon. Mayweather was spotted at the LA Lakers game last night (Feb. 19), sitting next to a very beautiful (unidentified) woman. Maybe they're just friends, but given Mayweather's past history with these sexy side-chicks...

Do Mstars fans think Jackson should take Mayweather back?

And what about those crazy "baby bump" rumors?

Floyd Mayweather 'secret baby' with new 'wife' Shantel Jackson!? Boxer hiding 9-month-old child with on-and-off again lover? Beach PHOTOS of baby and mama exposed!