Historically in comics when dealing with superheroines, they have always put a male "interest" there. Because of course a woman cant be complete unless she is pining after a man. Since after all, even if she has super powers what a woman wants is to be at home barefoot and pregnant. Today in comics most of the female characters still have some male "object" of somekind. Very few dont. But many of the males heros can get by without having that female love interest.

Steve was one dimensional in the tv series and for most of the years of the comic book has been equally one dimensional and used as the "damsel" in distress or the hero saving WW in unlikely scenarios. The most recent WW comic series has for the most part removed a male interest, until recently. But instead of a moon eyed love feel, they are going to flirtatious sexual innuendo route which is a nice change. There currrently isnt a Steve Trevor in the WW world. Only inklings of any romance was a brief phase with her and Batman. Just talking , tense sexual moments and some heavy petting. But they thought it best to stay friends.