User blog comment:SforHope/The Most Annoying "Ruining" Gag in Batman/@comment-1639863-20141204022203/@comment-18172179-20141204041951

I think that's basically the justification the writers use to avoid making him settle down. Belive me, after thousands of Batman stories being the same dark and brooding character, having him in a relation could be a magnificent thing if it was well done. A group of good creators might be able to find the balance to keep Batman truth to his roots and comfortable in a relation at the same time. It almost happenened in Batman: Dark Detective. But I'm guessing that it's just as hard as to have Poison Ivy being a good character fighting for earth and nature.