embarrassed of skinny boyfriend ...

My boyfriend barely eats , he becoming very skinny .. I always cook for him or go out and buy him food but all he eat is fruit and junk food. Everytime i tell him he’s getting skinny he gets very angry at me.

Update : I tried to make him go to the doctor but he just so rude when it comes to his size.. He skinnier than skinny.

I am concerned about his health...