How weird was this to do?

[ℐ]

Well he's your neighbor so he's known you for a while right?
Go ahead, tag him. I think it's fine that you did that. You just have to be confident with yourself! If he thinks it's weird, laugh it off! Don't act embarrassed. You're trying to be friendly... it's okay.
And so what if it completely gives you away, like you said, he either already knows or is really unobservant. And if he's really unobservant he's not going to notice this lol.

Girl, just go for it! Honestly.. don't be nervous. Don't really admit to mistakes (unless they were really bad!). Act like everything you do is on purpose.

Also.. guys like girls who flirt with confidence. Don't go straight up tell him you like him, but continue with what you're doing, not on obnoxious levels of course.. but just be you and do what you feel is natural. He won't think you're freak! He's only gonna think you're a freak if you're peering in his window with binoculars lol.