My fiance is starving himself, and he's getting sick and really scaring me... What do I do?!?

Sometimes you need to be straight forward with someone not to hurt them but be honest don't make it obvious but don't sit in the corner and let him push himself around tell him what his sister told you tell him you love him for him not how he appears and ask what push's himself to tell him he is overweight or doesn't look good and what not . Get him to open up he sounds alone he kinda acts like he wants to be alone but he doesn't exactly know how to ask to talk so talk to him get him to open up get him happy make him feel good about himself make sure eats