Lindsay Lohan and Samantha Ronson may be inseparable, but following weeks of arguments, friends tell OK! they fear that Linds will leave her DJ girlfriend — for a man.

Apparently LiLo has already been flirting with guys, and cracks are seem to be appearing in the relationship.

On August 5 at the Delano Hotel’s Florida Room, Lindsay, 22, cozied up to other men whenever Sam left her side.

“Lindsay was laughing and giggling with these guys,” an eyewitness tells OK!.

And earlier that day, guests at the Miami hotel witnessed the couple’s repeated clashes.

“Lindsay is the aggressive one in the relationship,” an insider tells OK!. “Sam tries to focus on Lindsay, but it’s never enough.” Another friend adds, “Lindsay has to be the center of attention, or she’ll flirt with other guys to make Sam jealous.”

But back in L.A. on Aug. 6, the pair were “hand in hand and very affectionate” at Crown Bar, and on Aug. 8, they partied for Sam’s birthday.

“The situation is between them,” Lindsay’s dad, Michael Lohan, tells OK!. “God tells us to love each other, and love doesn’t discriminate.”

But Lindsay’s friend says, “She’ll be with the next guy who catches her eye — she can’t help it!”

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