Is it weird for a woman to leave my number on a note on a guys car?

There’s a guy who definitely showed signs he is interested. I think he is a little bit afraid or at least not sure that I’m interested to because I’m very bad at flirting or giving signals.

The question is not if he likes me but how we should approach eachother.

He will be gone in a week and I know what kind of car he drives. Should I leave my note and my name ‘neighbor girl’ (that is how I heard he calls me talking to others). Or is it weird that a woman leaves a note like this behind on his car?
Is it weird for a woman to leave my number on a note on a guys car?
Post Opinion