Once they start this habit they'll always try to find excuse to tell you nothing going on, but always the same. Flirting with other men, getting other men to buy them drinks, chat up other men, having them buy dinner, then start dancing with them. Could lead to more too. You got a party girl there she loves to party. Her girl friends make this matter even worst for you two. If they get involve they won't be on your side they'll be on your girl friend side always..