Yeah...I rarely fall out of love with a char I love; I'll usually reject the show first. So in the case of Lex & Clark, I pretty much ignore most of the later seasons (the multiple canons for Superman make this easy!) I'm used to this - I've had a riverboat on the Nile for a long time! XP Clex is a bit odd for me anyway, because I usually go for fluffier pairings - but they're OTP enough for me that even though I agree Clark would probably be happier with Bruce, I can't help but still want Clark/Lex over anything.

And yes, I have some favorite chars that I can see with anyone, but others I can't split up. Partly because I'll have little interest in reading about my non-favorites, and partly because I'll become obsessed with a particular reading of a pairing and won't bear it otherwise. So even though Lex is my favorite, I can't really get into Lex/other unless, as you say, it's Lex/other with his secret love for Clark (he & Bruce will just have to battle it out! XD)