Why does someone just stop loving you in a matter of weeks? Why cant he just tell me he doesnt want it?

Why do they have to walk away from your love in such a cold way and not even tell you why? Not even give you any explanation and just ignore your reaching out to talk and emails and phone calls and texts when all you are trying to do is love them? I mean I told him that even if he wanted to go our separate ways that he could just tell me and we could just have a talk about it and say goodbye and he didn't have to end it like this. I didn't do anything wrong and he is treating me like as if I cheated on him or something. He is treating me like I did something horrible and I just wanted to love him.