Too Quick to Forgive?

A few weeks ago me and a friend were sitting down and talking about things going on, just catching up when at one point in our conversation the phrase came up, "I'm too quick to forgive sometimes."
  I admit it was me that said it, and any of you that know me well know that I am probably one of the faster ones to throw out the "hey it's all good, I forgive you." I absolutely hate letting anything sit for more than a couple days (much to the amusement of my friends sometimes after I say something like "I refuse to chat them for the X amount of days" and then end up trying to fix our differences that night)

 But as I went home after hanging out and I laid in my bed the phrase kept going through my mind. "Too quick to forgive."

Too quick? What kind of phrase is this? This is a phrase that has permeated our life and our culture, I've heard it everywhere in all sorts of different circumstances. But really, is this a valid phrase that we as Christians can be or should be using?