i just wanna shared a story and what do you think about it and what should i do?

I have a brother.. well, he's not my real brother. but i consider him like one. and he called me sister. we were just fine, 'till he had a girlfriend. he just go and left me. never texted me nor called me. he just like a stranger... 

okay, first he still act that i was exist but then he thinks that i disappeared. and i decided to do the same. but deep inside, I still consider him as my brother. I was the type to afraid of loosing a brother than a boyfriend.

today is his birthday, and i say 'happy birthday' to him. but he replied: "thanks. but who are you?"

and you know how broken heart I am??

he deleted my number on his contact, for God sake! how could he do that?

what should I do?? looking for another brother?