If someone or something leads you astray, they make you believe something which is not true, causing you to make a wrong decision. We drove east to Rostock, where my map led me astray. = mislead
If something goes astray, it gets lost while it is being taken or sent somewhere. Many items of mail being sent to her have gone astray
If you are led astray by someone or something, you behave badly or foolishly because of them. The judge thought he'd been led astray by older children