I feel like your "friend" who finds issue with you eating and has to throw up is incredibly insecure and has an eating disorder they're trying to justify to themselves by blaming you. They need some help but don't let them get you down they're really not worth it. I'm not sure if it's a translation error or if you believe it but these girls are not genuinely nice - they're textbook fake. If you are getting something out of this relationship at all, you can fake it til you graduate, but if you have other friends it'd be better for you to cut ties with them - it's not worth it knowing them and they're not your friends.