DEAR AMY: I am 20 and my girlfriend of six months is 19. Ever since we started dating, she seems to go out of her way to tell me whenever a guy hits on her, compliments her, or flirts with her. She’s gorgeous and so I totally understand that this is going to happen. I completely trust her, but when we started going out I told her that I don’t really need to hear about every time a guy compliments her. I told her that I know these things happen, but that I don’t need to hear about it. Finally, I flat-out asked her to stop reporting these things to me. Yesterday she was headed to her friend’s ho…