Hey, I want to ask you that at the first site do you trust everyone?

I am the who trust easily but this is my biggest weakness. At first time, I trust everyone. I do not know what is going on in his /her mind. I think than they are the one who thinks about me, cares for me, but at some thing, these people whom I have trusted they betray me when I am in need.

They are the friends in my good time, but when my time is worse they pretend that they do not know me.

I don’t want any friend ever now I want to be alone.