Confused

I keep getting more and more pissed off and maybe if I write about it then I'll get it out and not be mad anymore?! I don't think I'm a very jealous person. I have a lot of different friends and I spend time with each of them separately and sometimes together. But fuck, I don't get it. Why would you want to be friends with someone you know betrays you and talks behind your back and won't even admit that she does it when you confront her. I just don't get it. DO I confront you and ask you what the fuck you are thinking or do I just leave it be. I want to be done. I either want to be friends and the friendship be mutual or I want to cut our loss and walk away. I don't want to feel animosity anymore. I don't want other people that I hang around with to be burdened with my complaining either anymore. I want to just live my life and be friendly to everyone and enjoy life. Why is it not that easy?