Is keeping it a form of LYING?

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I don't really the answer to this. But seeing it closely, technically, it is really not lying. Not telling anything to a friend doesn't mean you have lied to him/her. You just don't tell them everything because there are things that we want to keep for ourselves. But what if that concerns your friend? Like, you have to tell him/her because he/she is involve with that. But another problem occurs, what if you know it would ruin his/her happiness? With that concern in my mind, I tend not to say anything at all. I don't want to hurt anybody. But isn't it lying? Or more like lying but covered with just a better coating? Because when you keep it and you know that he/she must be informed about it, you are depriving him/her of the information that he/she must know. I am in a dilemma now. To tell or to keep. I think I'll just wait for the right time to come.