He is so jealous!

Jennifer Lopez’s ex-husband, Marc Anthony, is livid that his former wife has moved on so quickly and with such a younger man.

A source is revealing that 43-year-old Anthony is going nuts and throwing tantrums over JLo’s new relationship with Casper Smart.

“He has fits and tantrums and is very stressed… [He's] lost a lot of weight,” a source adds.

So I think it’s safe to say Marc is on par with the Olson twins at this point.

But it looks like Skeletor, oh I mean Marc isn’t alone. Apparently Jennifer’s friends “don’t feel Casper is good enough for her,” says the source. “They are worried because she really puts her heart out there for love.”

So, whose side are you on, Jennifer or Marc?

I’m on Casper’s side, he hit the jackpot!