What do you do or say? Being taken advantage of? - 1

My 17 year old cousin met this guy on an iPhone app and they met up and hung out twice. They went out twice in the span of a month (while talking for three) and she kinda fell for him. She's been taken advantage of by other guys but she never encouraged them or anything. IPhone app guy was her "first" last week because he really did have a way with words. Now he barely texts her. He never defined their relationship and she's telling everyone they met through mutual friends. I knew this would happen and my boyfriend did too when I told him. It all seemed sketchy and I even warned her. What should I do to help comfort her?

Tell her she needs to be more careful with guys. That was way to soon to get with a guy that you've only known for a month, unless it was more, I apologize. It'll just take time to get over the situation.