My 18 years old daughter has being dating her boyfriend from almost a year. At the beginning things look normal but lately I had notice that some of the things he does made him looked like he doesn't really care for her as he used to. I have brought up some of these things to my daughter but she always tells me that he does care. Last week they went to a school trip and they spend very little time together. He told her to meet him at specific time to go to the bus together and at the end he didn't show up and went to the bus without her. I really feel that he does care about her as much as she does for him. I feel that is my duty to talk to her and may be she would be able to see it. What should I do and how?