will-they-won't-they

Short definition from Wiktionary

Adjective

1. 1
   Of or pertaining to a potential coupling between two people who share romantic chemistry, but whose relationship is threatened by uncertainty, external obstacles or internal strife.
2. 2
   Of or pertaining to any situation in which there is an extended period of uncertainty.
3. 3
   Alternative form of will-they-won't-they.