Her desire to touch people.
I seem to notice that anytime Rogue got the opportunity to be physical with a man she always ditched gambit for the man.
In AOA, She dumps gambit like a fly when she discovered tht magneto could touch her and they began one of the most disturbing and perverse relationship in xmen history even marvel were ashamed to market the aoa toys with rogue and magneto as a couple
Another perfect example is the xmen cartoon series, when Cody came back in the episode love in vain. rogue basically dumbs and treated gambit like crap for a guy she has not even spoken to in years all because the guy said he could touch her.
Then there was that nonsense that happen with Sentry. Although I do not acknowledge it as canon. it was so lame....beyond lame.
I used to be a rogue and gambit fan and in a way, i am still on but oh my gosh, I HATE THEIR RELATIONSHIP IN X-MEN the animated series and it is now making hate them in some of the comics.
I am not even sure rogue was actually in love with gambit in the cartoon series, the only reason why she seem to care about him was because he was the only one that showed her any affection.