Friends?

I find I have very few these days. It's actually very upsetting.
I had a brother, a best friend, but he has changed so much. It hurts me so much at how much he's changed. I feel betrayed, I feel used, and most importantly, I feel forgotten and unloved. The maturity of a man is always questionable to me, and I once thought he was the most mature person I had ever met. Quickly I realized that I couldn't have been any more wrong. I woke up last night, reality finally hit me, and the harsh reality is that he is not the person I thought he was. He is easily influenced by his "best friends", the same people who have pushed our friendship away, and I can't take it.
I'm just so done...