Originally Posted by
bat39
Selina Kyle is the closest Batman has to having a canonical iconic love interest ala Lois Lane or Iris West.
On one level, it makes intuitive sense. Who ELSE would Bruce Wayne possibly fall for than the woman as damaged, conflicted and multi-faceted as himself?
Bruce can't be with a normal woman because he doesn't lead a normal life...so it makes sense he'd be attracted to someone as 'abnormal' as him. Contrast this with Clark who, despite being alien, tries his best to live a normal life, and surrounds himself with normal people and normal relationships.
Also, the fact that in most versions, Selina is reformed, or at least becomes more of an anti-hero (or is it anti-villain) I think also convinces Bruce that some criminals can be reformed, and it injects a much needed dose of optimism to his crusade.
There's also the fact that, Selina has been Bruce's love interest/lover for long stretches of time in 'mainstream' continuities. She canonically was married to him in the Earth 2 continuity (which represents the original Golden Age versions of their characters...meaning that original Bruce and original Selina ended up together). She ends up with him in the Nolanverse. In Gotham, she's the first girl Bruce seems to be interested in and there's a clear foreshadowing of her becoming one of the most significant people in his life later.
So her canonical status as the main love interest is pretty darn close to being cemented.