Play hard to get
Definition 1 of 1
Pro Tip 1/3Romantic Strategy
This phrase often describes a dating tactic where someone pretends not to be interested in a potential partner. 
She's playing hard to get, hoping it will make him more interested in her.
Pro Tip 2/3Not Just Flirting
Although common in dating, 'play hard to get' can be used in other situations where someone wants to increase their appeal. 
The artist played hard to get, making galleries eager to host his work.
Pro Tip 3/3Psychological Tactic
Playing hard to get can be a psychological game to make the other person want what seems out of reach. 
The interviewer seemed to play hard to get, which made the job seem even more desirable.