It could mean that he doesn't feel the same way, or it could mean that he's simply shy. The only way to know for sure how he feels is to talk to him about it.
These are sometimes called catch-alls.
it doesnt if you catch right
use a Pokemon like golbat for an example use "mean look ' or whatever its called it doesnt let the Pokemon escape. damage it, make it sleep catch it
No you can not.
it doesnt matter where, you just need to be lucky to catch it
that doesnt make sense
it doesnt move
get stung and then you can get it but get it by the bottom and i think it doesnt sting
After you get to Kanto and talked to Eusine, go to the cape outside of Cerulean.
sometimes it depends on what fish you are trying to catch
They catch it by the tail, or sometimes bite its body, whole.
It is possible that he is just very nervous, but you will have to assume that if he was still interested in you he would at least have responded when you spoke to him.