The only danger with that of course is if your girlfriend finds out, which happens quite a lot. You also have to be prepared to bottle things up and not feel too guilty, which can be very hard to do sometimes. I still feel you're right to tell her; at the very least she'll appreciate your honesty. It's better this than her finding out or you telling her further down the line; then she'll wonder why you didn't tell her sooner.

- Mark