Get closer
yea that happened on my 2nd date sorry
Ask a girl on a date and be a gentleman!
no because then your girlfriend would be cheating on you with your friend and you will be mad
never
That all depends on the willingness of his date.
If you're fighting with your girlfriend and you're not totally broken up you should never date anyone else as it's considered cheating; if you don't like your girlfriend anymore break up with her for good and then you could date other girls, but I recommend you don't if you're on a break (head space) with your girlfriend.
no
It is not so much the fact that it would be weird if you date a young man that thinks your brother's girlfriend should have been his girlfriend, but be more worried about the fact he wants to date you to be close to your brother's girlfriend so be smart and don't let this young man use you and cause not only problems for your brother and his girlfriend, but also getting hurt yourself.
I dont think you should.
ASAP
If he invites his girlfriend to homecoming, you should probably your own date to homecoming.
You should just ignore them and date someone else better then her or him.
It means he has poor morals and no integrity. Date him at your own risk.