Bravo. I have to spread the rep, but I couldn't agree more.
To the OP, bottom line is this, you want to cheat. That tells us a lot. One, you can't keep it in your pants even though you claim to love this girl. Two, you don't have any morals. Three, you're immature and not willing to go without in order to maintain your relationship.
We've said what needed to be said, we told you what you needed to hear. You're not here for advice, that much is obvious. You want someone to tell you it's okay to cheat. The fact is, it's not okay. So, you have to decide. Do you love her enough to keep your penis out of another woman, or do you screw around, put her and yourself at risk?
The fact that you don't think cheating is a big deal is really disturbing. Let her go. Let her find someone that can love her enough to not only think about himself and his penis.