Another trick that recruiters use:

Ask you where else you have interviewed, and even get names/contact info from you if they can. Then they call that place and tell them that they have a stack of resumes of way more qualified people than you.

You may never hear back from that place for two reasons: 1) they think you sold them out to a recruiter, 2) they believe the recruiter and start interviewing new people.

Bottom line is that recruiters will sell you out any chance that they can get. As much as they may seem like your friend, you are not their client, you are the product they are selling.