If you can't trust your bird to go out, get off her face (if thats what she likes doing) and not to get off with another guy, then she wasn't good enough for you in the first place. Sure it'll hurt for a minute but you should get over it pretty easyily when you compute that you never wanted someone you couldn't trust anyway.
With exception of STD's, it's not something worth worrying about really.
With exception of STD's, it's not something worth worrying about really.