He asked me out before but flakes. But everytime he sees me he can't seem to stop staring. I also think he is finding excuse to bump into me. I don't really show much interest but we are on friendly terms. I wave or said hi if I sees him. I don't think he is shy because he did ask for my number and ask me out for coffee before he cancel. I mean if he cancel and never ask me out again i take that he's not that into me. But I don't know why he is staring or always showing up or even ask me to his birthday. We don't even know each other that well. Any clues?