I don't mean the worse reason you gave them, but the reason you had for yourself in dumping them.

Mine was when I was younger, I dated a girl and she wouldn't kiss me in that 24 hour time period (I tried like 10 times) so I dumped her.

Anyone else?

Also you can include or use the reason somebody dumped YOU

"Alls Fair in Love and War"
~Frank Smedley