You were wrong.

You made a large mistake.
Instead of becoming defensive and denying it, just own up to it.
We all make mistakes that can lead to someone being hurt, sometimes...even ourselves.
I am not mad at you for what you have done, but rather upset and disappointed.

You say that you feel if you are honest with people, that the truth will hurt them.
Well, truth is: when you aren't 100% honest with someone about everything, and you don't tell them things--it can hurt too.

I truly hope that you are able to learn a lot from this experience in many aspects.