He is just stringing you along.
string along
idiomTo keep somebody falsely believing that one has certain intentions.
She realized he was stringing her along when he kept delaying their wedding plans for years.
The candidate continued to string along the voters with empty promises, despite having no intention of fulfilling any of his campaign pledges.
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another string to one's bow
Another skill, ability or resource to be used in case of failure.
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apron string
A symbol of the domestic ties binding a male to a female (as a husband to a wife or a son to a mother).
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harp on one string
To dwell on a single subject with disagreeable or wearisome persistence.
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harp on the same string
To repeatedly say the same thing.
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second string
Not as good; of a lower quality or condition.
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string attached
A condition, catch, limitation, caveat, restriction, or requirement
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string out
To prolong or extend in an unnecessary, contrived or time-filling manner.
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string to one's bow
A skill, ability or resource.