They know she has a boyfriend (supposedly) but what you are saying works both ways tbf, why can't she stop flirting with both of them if she has a bf and she knows they like her?
She's carrying on her rinsing game in there IMO she has already had The Situation saying he will buy her a new dress, her eyes almost lit up with money signs when Lorenzo was telling her about his family and properties etc so now she's moved onto him to see what she can get out of him.
