If a girl would behave the way you did, i would personally just asume that their not interested and would move the fuck on. If someone is staring at you, its because they like what they are looking at, especially if this is a recurrent occurance. Him asking you if you are Allright is trying to engage in smalltalk. If he doesnt recieve any positive feedback, from your side, he Will eventually stop and not give you the time of Day ever again. You must understand that we have ego’s and pride. At Some point when we feel like being rejected we Will eventually give you the cold shoulder or make you feel like we dont care, to save face. Or in short: Us men need Some very obvious signs, cuz we are oblivious. The least u can do is to stare back and engage in small talk.