keep someone dangling
keep (one) dangling
To maintain some form of relationship with someone without revealing one's true feelings or intentions; to keep someone in an uncertain position. If you don't want to marry him, then you have to tell him that—you can't keep him dangling any longer! A: "I'm never going to get a promotion, am I?" B: "With the way the boss keeps you dangling, I doubt it."
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
keep someone danglingkeep someone, especially a would-be suitor, in an uncertain position.
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