My Dad. Been NC for over a year when after my suicide attempt, he texted my Mum (they are divorced, he remarried with the woman he got engaged to whilst he and my Mum were still together) asking whether it was another "cry for help" and that he was "fed up of my bullshit" 
I decided right there and then that I was no longer going to pretend that he loved me, that he wanted a relationship with me or that he was ever going to apologise for the systematic emotional abuse he threw out to us all as a family. I told him to get out of my life, but that if he ever grew a pair of balls and recognised the severity of what happened (he's ever so keen to pretend it was just a end of marriage situation, rather than him being a callous adulterer who cruised internet sites) then providing it was was a reciprocal, healthy conversation that didn't include him blaming his problems on everyone else (mainly me) then I was welcome to hearing from him. I also said I would under no circumstances ever see him with his absolutely vile wife, who throughout all of this has goaded me over the fact he left my Mum for her - without explicitly saying so.
She has quite happily allowed my struggle to have a relationship with my Dad turn into true apathy on his part - he's always been emotionally detached but she really brought the A game. She must have something worth hanging onto - she doesn't work and lives off my Dad's pay, was married twice before with hefty divorce settlements to fund her luxury lifestyle deliberately by having children (she's more or less admitted to this and her daughter, my 'step sister' has confirmed it). She is certainly poison - as much as it sounds as if I'm the bitter daughter of divorced parents, my paternal Grandmother hates her too; she's pretty much washed her hands of her own son for his narcissistic, manipulative behaviour. She still sends my Mum birthday/christmas cards - it must wind up my Dad's wife something chronic 
My Dad walked out on my Mum when me and my brother were just into our teens, without saying anything for four months. My Mum had to contend with bailiffs, funds emptied out of the joint account and having our phone bill cut off. My Dad used the excuse that he was "having a breakdown" whilst simultaneously shacking up with wife no 2. He also rung debts up in joint names, and when the house was finally sold all the money left over went into clearing his 80k (exlcuding the mortgage) debts that my Mum knew nothing about (god love her, it was the man's job to deal with finances).
It fucking hurts, truth be told. I've been told numerous times that my destructive childhood/adolescent was because my Dad either ignored or blamed me for everything - it's something that as an adult, I assume of everyone. He utterly clouds my judgement of nearly everyone I meet. I have always wanted him to be sorry and apologise and mean it - he won't, and I can't keep running to him hoping to be loved. The hardest decision is knowing he won't walk me up the aisle not because he can't (through death or illness) but because he wouldn't care enough to do so. To know there are so many out there that either have lost one parent or both and would dearly love them back, yet I am choosing to have NC with my Dad makes me sad too. I just wish I had a Dad.