Is he afraid to ask me out again?

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?
Is he afraid to ask me out again?
Add Opinion