Aaaah, ARE YOU FREAKIN' KIDDIN' ME?!? You're saying you have a ticket and want to go, but you're not? Huh?!?
Is it because you happen to hate flying or because of something sentimental about your ex? If the latter, then, dude, you can't let her have exclusive hold of something that might be dear to your heart. (That'd be like me forgoing kayaking just because xW and OM are now kayaking -- no f'ing way!)
If you change your mind, bro', let me know. Our tickets kinda' suck, nowhere near the line (Diamond Towers, got 'em through an offer at work), but my kids don't mind (they'll just be happy to see the cars go round.)
