They hate each other but it seems they're stuck with each other, even if just for Finn's sake. Poe can't understand what Finn sees in her and Rey can't understand why anyone would find the Pilot charming in any way. Circumstances being what they are in a war with the First Order bent on the Resistance's annihilation, they must tolerate each other and maybe loathe each other less.

Rey and Kylo have awakened something more dangerous than they can imagine with their bond. No matter how hard you fight, the Force will guide you where you need to be. {Takes place post The Last Jedi}