Move on. If you go after him, you'll loose all interest he ever would and did have in you. If you find yourself in a trap situation become best friends with his girlfriend to the point she's your sister.

don't you give up,they not gonna last

it will go away. It might suck and take time but it will fade.

IDK. I'm in the same boat but switch the genders :/

don't tell him, the last thing you want to do is make him uncomfortable bc he probably doesn't like you back if he has a gf. i would recommend waiting till he is single to tell him, or just move on.

lol same.. just don't get in their way cuz that will get u in trouble

either wait or make him notice you