The Resistance realizes that the more sexually frustrated these two are, the more they're likely to take out their tension on the First Order. Both have been manning ridiculously successful missions blowing First Order shit up because they're sublimating their feelings, and so, even though it's cruel, upper command has been doing their best to sabotage Finn and Poe's romance by keeping them apart.
Finn/Poe- Their UST is winning them the war