hate shea?

So, yesterday in Spanish i was like, Shea, why did you write, i hate maddy in your binder? And she just laughed it off and was like oh that, i wrote that a long time ago, when i was mad at you. And i believed her. Big mistake. So i go to softball practice after school (Shea's not on the team) and i'm playing catch with Allie-Rose. And shes like, you know what Shea said about you in lunch today? and im like no, what did she say? She had smashed her milk carton into the table, crushing it, saying i was the milk carton, and i dont even know what i did. So then we met up again later at o'hara (we had a quiz bowl with like the toughest questions on the planet there) and i told her about it and she laughed it off again. So then we had fun the whole time and she was nice today, and i dont know what to think!