Confessing something to a friend

Recently I met one of my best friends (you might say best friend should be one - I have given away that thought long back) and told him something - well how do I put it - something I shouldn't have said; but that something he needed to know and only way of him knowing that was when I said it to him. It may sound confusing but this is actually the way it was. Maybe I shouldn't have thought that way but it was true and so my thinking that way was justified. Well then he should have known it but then he said that for him to know certain things he needs to be told explicitly; so he couldn't have known that. Am I going in circles? Okay let me say it straight. This is what I told him -
"You know what dude I know I can count on you. If I need you, no matter what time, I can call you and I know you will be there. There are a lot of things that I want to talk to you about but can't, you know why, because I don't trust you to keep the things we talk about to yourself and I don't want someone else to know what I told you."

When I told this to him he was hurt (he didn't say anything but I could see it). Later I asked him if he knew this all along and he said that he knew I didn't tell many things to him but he didn't know why. And now that I have told him - bluntly - I don't know how he feels. I had wanted to tell him this for quite some time and now that I have done so I am glad that I did it.
I am pretty sure this doesn't spoil anything between us; because even though this doesn't look so good, it is the right thing. Being friends he ought to know certain things and I should be frank with him. I might have done this earlier or maybe in a better way but I think there's no point thinking about it now. And now that he knows the reason I am sure he understands a lot more things without saying.