That's great that H shared that with you. Immediately read "How to improve your marriage without talking about it" if you have not. That was written for your sitch.
That said, don't be too hard on yourself, I'm sure you have your own catalog of hurts and unmet needs. Focus on what to do going forward versus deconstructing what's happened.
Peter
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015