Last weekend me and several friends went to a festival. In the group there was one girl I have known for 3 years now and the last time I saw her again was after 2 weeks. On Saturday afternoon I left our group for a while and met new people, including another girl and finally I spent several hours with her. When I returned to my buddies they told me that the other girl I mentioned above told the other guys I was hanging around with my "new girlfriend" (that is bulls* because I saw her for the first time and don't plan to see her again). Since then she suddenly ignores me online and offline.
I was wondering whether she might be jealous or just seeking attention? Or something else? I really like her.
I should also mention that she started to behave somehow different than before: Sending me pictures of herself or with her pets, asking me to go on holidays etc.. I also have the feeling she tried to make me jealous; talking about another guy but later telling me he is more a woman than a man and she would like to find the "right one". I also have the strong feeling she was jealous when I talked about or to one of her girl friends or other girls she doesn't know. Sometimes she was again behaving like a normal friend.
I try to be nice but now she doesn't even reply to my messages now. What can I do?