I have a girlfriend. I like her brother so much for almost a year, but I never told her that. Two of us (her brother and me) were not formally introduced to each other. But he knows that I am his sister friend, because she probably talks about me in her house. It seems that he likes me too. Once, we exchanged very long eye contact. Also, he would stare at me from the distance, and than quickly turn away when I look at him. He once even got too loud in my presence. It seemed that he want to get my attention. I often see him on my way to workplace or home. But he pretends that he does not know who I am. Suddenly, her sister (my girlfriend) , started to mention him all the time in our conversation: My brother this…my brother that… Do you think she know about my feelings or she just wants to find out what do I think about him?