There's a question I see all the time on this site. "This girl/guy I know did such and such; does she/he like me?" This question won't get you anywhere. I don't know the person your asking about, and as such, cannot tell you whether they like you. Everyone is unique. Different people do things for different reasons. One girl might slap a guy on the arm to flirt, and another might do it because she genuinely hates you. One guy might hold the door open for you because he thinks you're cute, and another might do it because he's just a gentleman. You can't just give me one example of somone's behavior and expect me to be able to tell you if they like you; it just doesn't work like that. Everyone has their own personality and motivations. Reasons for the things they do. Pay attention to people, take a risk, and know that the only way to figure out if someone likes you, is to talk to them.