"baiting" girlfriend with fake accounts

In the 2 years we've been together, I've been trying to bait my girlfriend with fake online accounts, such as on myspace, AIM, etc. Knowing that she's fucking another guy is one thing, but actively participating in her sneaky secret would be the ultimate high.. It seems like no matter what I do, she ignores me. Yet, she does talk to other guys. One problem may be that we know each others passwords but of course there can be secret accounts since we don't live together. I'd like to know if anyone has cleverly fooled their GF like this?