I'm not against Clark and Diana as a couple, but I'm not a fan of how it's been executed so far in the comics. Their relationship is obviously more of a plot device than an organic pairing of two characters with a mutual attraction. From what I read in Justice League, it looked like Diana was just trying to find a way to protect Steve Trevor from bad guys going after him to get to her. Could she be getting some genuine "feels" from the relationship? Maybe, but we all know Clark will eventually find his way back to Lois.
I'm sure it will all be over by the end (or beginning) of Trinity Wars.