Janis had done this before. And she wasn't gonna let what happened before happen again. She was keeping you by her side, for real this time.

You were clueless about Regina George, she invited you over to her table and you guys talked, you because a plastic and did a ton of things with them of course. Then came a party, she kissed your crush, you ran out of there to meet Janis and Damien.

They literally had made a bet on how long it would take, but they wouldn't tell you that... So, Janis told you a plan, different from last time, it was guaranteed to work well. No ex friends now.