Why did she change?

My ex boyfriend new girl use to be really good friends with me. We would laugh all the time and we would talk about how much we hated our jobs. We would speak to each other outside of school etc. Ever since she started dating my ex boyfriend she’s been so rude to me. Every time I talk to her she always rolls her eyes and every time I make a simple mistake she lets the whole class knows. This isn’t the same person I’ve me
Why did she change?
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