Tropes, Stereotypes, and Clichés
Blog post by Alex Bledsoe: Heroes and Girlfriends
Alex Bledsoe has written a great blog post swiping at the annoying "new love interest in every installment" trope, as well as "Women in Refrigerators" syndrome. Definitely worth a read (as is his Eddie laCrosse series). I already determined some time ago that if I ever write a sequel, I won't come up with a new love interest for the main character, and I'm glad I'm not the only one who feels this way.
(BTW, check out Bledsoe's "Eddie laCrosse" series. It's very well-written.)