Secrets Equal Lying?

Is keeping a secret from someone close to you the same as lying?

Once I got a speeding ticket and I didn't tell Paul because I was going to have a friend take it to Traffic Court for me.  I thought...I'll get it cleaned up and THEN I will tell him.  Well I forgot (since I hadn't had a ticket in awhile) that when you get a speeding ticket you get TONS of junk mail about taking a traffic school course to have the points removed.  Needless to say, Paul found out by checking the mail and then was pretty upset with me for not telling him.  I wasn't necessarily not telling him for any particular reason.  I just thought...why tell him now.  He said keeping secrets was like lying and that we have to be able to have trust.  Seriously I thought he was blowing it way out of control but I guess keeping secrets can be a slippery slope.

So what if your friends are keeping secrets?  Is it the same as keeping it from your partner or family?  Is it breaking the trust of the friendship?

I recently found out that a really good friend was keeping a pretty big secret from me.  I am torn as to what to do?  Should I be hurt?  Does it mean she doesn't value our friendship?  Should I say something to her?  Will it just become a big huge mess if I do say something?

I am the first to admit that forgiveness can be a long process for me.  I just get really upset when people I care hurt me.  I usually just cut toxic people out of my life once they become extremely toxic but I ultimately never cut out the people I care for...no matter what.  I mean sure I'll get upset but aren't most relationships equipped with unconditional love.  

Not sure what to do...so for now I will do nothing and just let her continue living with her secret.  Isn't ultimately her life so she can do whatever she wants?