If you asked a girl out and she said no but your friends say she really likes you should you ask her out again?

It depends on why she said no, give her another chance and see what she says. If she says no again, without an explanation, perhaps you should move on.

New Answer HeadlineYou should get to know her, as friends, and maybe it will lead on from there if she was truly into you. If she wasn't then, you two will stay friends and she won't flirt with you.