My brother's boyfriend is acting weirdly ?

Well my bro's bf stayed at us for this WE
He acts weirdly with food and constantly talks about his weight he's like 45 kgs for 5'4"
But yesterday I caught Shane (his name) making himself throw up,
he was sticking his fingers down his throat and throwing up water n blood
his fingers were covered of blood n he was crying
he didn't know that I spotted him,luckily
I told to Kyle (my brother),he called him and asked him he said that he was just nervous vomiting I said "Noo ! I saw u sticking ur fingers down ur throat !" He said that was lying !
Kyle told me that Shane was very skinny but still healthy
Shane is a very hot guy,that's so shitty he's anorexic !
He doesn't eat a lot,like a cup of tea an apple for breakfast,some salad and sugar free yogurt for lunch and nothing for dinner
Today for lunch I forced him to have some pasta with chicken n cheese and Some jelly
I heard him talking with his ex girlfriend(he's bi) and now best friend he was saying "Omg I binged that was like 400 cals" and that b1tch told him "Go puke and fast the next 3 days !" then she cuddled him,she was like happy and he was just needing love and support :(
I'd like to help that guy ...Pls tell me how should I tell my bro that his bf's sick ? I mean how to prove him ?
 
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