Surma left Jimmy because...

[Tobu Ishi]

...he came back from his training with his natural hair color grown in, and she realized to her horror that he had been a bottle brunette all along.

Obviously, she couldn't stay with a man who had lied to her about his hair color. Saddened but resolute, she turned to Anthony, a natural brunette, for comfort, leaving the raven-haired Jimmy to cry bitter, bleach-free tears alone.

(In a fit of grief, Jimmy chopped the offending hair off short, and long years passed before he could bear to grow it out again.)

What?

[Necropaxx]

I knew it! ;D

[theweatherman]

Wrong.

Eglamore was a kung fu ninja warrior who could use magic, but one day Anthony challenged him for Surma! With all of their might they fought a mighty battle that lasted 20 minutes, only the arrivial of their headmaster stopped them, cos Eglamore's foot was too deeply imbedded in his face to pull out (it was a accident, probably) Eglamore went to China to train and do some soul-searching with piano music in the background (kindly done by a Shaolin monk) when he returned, Surma was pregnant with Annie, realising that instead of soul searching, he should have just talked to Surma, he left them to their own devices once they left Gunnerkrigg.

Or maybe we'll find out later.

[shuis112]

Until Tom tells us otherwise, this post on the art thread is canon for me: gunnerkrigg.proboards.com/index.cgi?action=gotopost&board=general&thread=21&post=46410

[atteSmythe]

He should've made his hair go up. Winsbury knows what I'm talkin' about.