What does it mean when you ask a guy out and he says I'll think about it?

Well he's just not sure if he wants to! There might be someone else or just he needs a little time before he answers! In addition I am not a girl but I said I will think about it to a girl and she took it as a yes. You are really brave to go and ask him out. If you have any q's u can post it on my message board.