if the ending is predetermined by the comic book then i think the comic book has a gay ending. but ive never read the comic book and it seems to me that all books made into movies lose something in translation so...
that becomes a non-issue as far as im concerned.
him killing himself did not go with the theme. if his bum ticker had gone out as she held him in her arms then it would have gone with the theme. killing himself wasn't the only solution. he could've left. he had no better reason to kill himself when he did than sometime after he saved her once and before he met her at age 19.
in reality, his suicide probably left her pretty fucked up. if this chick couldn't get over him during her entire adolescence then she's got issues. his suicide would have not done anything good for her concerning those.
the crap about them finding her again is bogus. what kind of power would the senator have outside of sin city? leaving would've been easy and maintaining outside of his grasp would've been easy, and even if they did find them again (very unlikely considering who their pursuers would be and her's and hardigan's intelligence) it would've been worth the years they had together.
he didn't have to kill himself to save her. i cant believe he couldn't find a better solution.
anyways, his bum ticker failing on him would've been a little keener considering the theme and forshadowing.
BTW, the majority of good movies out there dont have typical hollywood happy endings. they have real endings. in reality, hardigan would've died by somebody else's hands or left with the gurl.