Is what I did so wrong to this girl?

Its not wrong for you to like more than one person. But it is sort of rude to talk about another girl to someone who likes you. Girls DO NOT like that, its actually a serious let down. And i guess the facebook game thing is a little immature, but considering shes already mad at you as it is, making her the 'deadweight' isnt the way to make her less angry at you.