When the semester ended, she applied for an internship without telling me, despite claiming she wouldn't.

You guys went to the I.T to increase your chances of getting a job after the university level. So, if she’d said she wouldn’t apply for internships, you supposed to know she’s lying….

But why I’m sad about this whole story is her refusal to teach you whenever you have challenges during the I.T. Is she afraid that you will know it better than her?? Because that’s really bad of her!