[quote=@CrazyShadowy]
[@Buddha]
The thing with that is this isn't an online relationship.
[/quote]

You need to stop worrying. The fact you're worried that she might cheat on you is an obsession with control, in general (not over her specifically, but just you feel you're losing control and because of this something bad may happen). You can't worry whether or not someone will do something they haven't done. If she's going to do it, she's going to do it, and that's that whether or not she does it near you or far from you. It may hurt, but pain comes and goes. Your life won't end and shouldn't end because of what some woman does. Furthermore, you shouldn't attach all your happiness to another. A relationship, in full, should be a bonus and not the prize. Otherwise, you'll find yourself obsessed with the acts of your significant other and push them away.