Bruce Wayne's love interests
Why does he a different love interest in roughly every movie? Granted I don't think there's really an answer to this, since the studios and writers themselves likely don't know.
Three versions of him had a slightly romantic relationship with Selina Kyle: Batman Returns, The Dark Knight Rises and Gotham. Multiple versions of him had a romantic, sexual or even procreative relationship with Talia al Ghul (comic books, graphic novels, animated series, animated movies and The Dark Knight Rises). (If that's a spoiler, then my apologies.) Then there's also Vicki Vale (Batman [1989]), but also two others created specifically for the works in which they appeared: Chase Meridian (Batman Forever), Rachel Dawes (Batman Begins and The Dark Knight) and Silver St. Cloud (comic books, Gotham). I'm sure there are others. Often, however, he is plainly single.
Imagine a universe in which Bruce knew all of them. Even as a matter of serial monogamy, it would be wild!
Anyway, who is he meant to ultimately be with? It seems to come down to a race between Selena and Talia. They are fighters (yet antiheros), whereas all the others are kind of like bait for being damsels in distress. Yet all of the are committed to their professions and take their work very seriously: a reporter, a psychologist, an attorney, a ninja and a burglar, though notably the reporter stoops to the lowest levels or puts herself in danger to make headlines.