The Day I Don't Want To Talk To Anybody

Sometimes, I don't understand some peoples. I thought I know them, but somehow they became totally different, they acted like strangers to me, they acted as if we didn't know each other, and the worst part is when they showed that we are not belong to each other. Why they changed? I understand that people might change, but not until to this extend right. I'm still remember those times when we had so much fun together; we lepak, watched movies, party, drinking, holiday, laughed, talked until we fall asleep, we shared everything ups and downs but now all those fun had gone. I maybe too emotional about this, but don't be too ignorance towards me.
I'm so pissed off!