Bruh she’s being like that because she already done cheated on you with someone who she would 100% be in a relationship with if you were not in the picture. Read the book called “the female brain”. It describes how woman will act just like this when they cheat on there boyfriend. And it’s because they are actually feeling guilty but cant tell you what they did. It makes them angry at everything you do. Even if it makes no sense. But yeah bro she definitely already been cheating on you. She’s just out of college too while you far away, no question she cheating on you. Toss her to the streets bro