Charles Xavier: Moira McTaggert

Erik Lehnsherr: Raven (even though they weren't together they were really close)

Hank McCoy: You didn't have a reason to be jealous because no one ever flirted with Hank.

Alex Summers: You're never jealous because most girls are scared of him...but sometimes you get jealous of Kitty Pride.

Logan: You're sometimes jealous of Jean Grey but she's your best friend and plus she's with Scott...

Kurt Wagner: You're a bit jealous of your sister Jean because of how close she and Kurt are. 

Scott Summers:  Jean Grey because what's not to like about Jean Grey?