Replying to Ski Season & Girlfriend

Right, so i've applied to do the 2012/13 season abroad (probably France) and i've got a few interviews, my girlfriend isn't too keen on the idea, we've been together for 18 months at the moment so it would be 21 months by the time i go away.

The thing is, she doesn't want to break up, but i don't know if i can stay faithful out there for a whole 5 months, especially if the girls doing season are anything girls i've met out there before...

Has anyone done a season and stayed with their girl? or is it just pointless trying to stay together?