Call me SELFISH but I can't be happy for him

It's official.. Sila na! Well I knew that's gonna happen and I'm ready for it, that's why I'm not shocked. Though I saw it coming, it's still painful for me... I can't be happy for him. But life goes on, everything that happened between the two of us will just remain as a memory that I'm wishing to be easily forgotten later on.
I don't know If I still consider him as my "BEST FRIEND" because it seems like he don't consider me as that. And right now, we don't act as best friends, we barely talk to each other.

I don't want to confront him about this matter,because he might say that I am being "demanding" just like the last time that I talked to him about this. I don't want to be the first to approach or to start the conversation over the chat maybe because of too much pride, and if he really wants to talk to me, he'll be the one who's gonna approach right? Well, I shouldn't expect too much from him, specially now that they're already official.
I can't describe what I felt when he apologized to me the day after I received the news. I'm a little shaky and my heart beat fast. He's sorry for not telling me right away , at first I don't know how to react and I just said that it was okay. That's one thing that I'm starting to hate myself, which is pretending that everything's okay even if it's not. After his apology we just had a short casual conversation. He said that I always gave him courage, but that didn't made me feel better.
They say that if you really love someone, you'll be happy to see him happy even if he's with another girl. yeah, I'm glad to know that he's happy, but knowing that he's happy with another girl? well that's a different story.