**TL;DR:  You don't need to read the following if you don't want to, I'm not really looking for advice specific to my situation.  Just any insight on the Title question is appreciated, what your own experience is like with cutting people out of your life for whatever reason.  Also for those that haven't seen me on here, I'm diagnosed BPD and with regards to the question, looking for advice from other Borderlines.**

Just dealt with some stalker bullshit from my father.  Haven't talked to him in a while.  He claims he has changed, but I gave him too many chances.  For context, he is diagnosed with NPD. The guy has been told by literally everyone that he should just leave us the fuck alone, that what he did to us was fucked up on so many levels and that he doesn't deserve to be a father.  Over the years, he abused me in every way possible.  He shows no remorse for his actions, as evidenced by the fact that he says that he feels justified in what he did to me because look at how well I turned out (with regards to athletic success).  He doesn't understand how fucked I am.  At this point, nobody in my life outside of my therapist can because I'm not comfortable disclosing all the shit I feel to anyone because the ones that do know part of the story have found a way to abandon me.  He is asking for the millionth time for me to forgive him.  Its the never ending cycle of abuse.  Just nowadays, its emotional and verbal abuse because I could kick his ass if I wanted to and didn't feel like shit about myself for hurting someone or their feelings.  I forgave him every time.  Always giving him the benefit of the doubt, no matter how bad the abuse was, no matter how badly he treated me, my mom, and my brother.  The guy is just a walking broken promise.  He claims he wants to change but every time it ends the same goddamn way.  

I haven't talked to him at all in about 3 months, but he has been blowing up my phone with voicemails and texts every day.  He showed up at my door today.  I couldn't face him and open the door because the sight of him and listening to his voice makes me sick.  

I had to explain to my kind-of-stepfather (who stopped by to check on me) that dealing with him makes me want to kill myself and that it is just self preservation when I refuse to deal with him.  I can't put myself through this bullshit anymore.  He keeps pushing for me to have a relationship with him and a sister that I have long since disowned for being too much like him to me, my mom, and my brother.  He says that since we are blood, we should be close.  But holy shit, its just so frustrating.

I've cut people out of my life before, and every time I still feel pain whenever someone brings them up or I think about them.  But most of the time, I understand that I did myself a favor by cutting them out because it prevents me from feeling like shit.  In almost all the other instances, I don't see the other people on a regular basis or at all so I don't mind.  

I think I'm just wondering if I'll ever be able to cut my father out of my life and not feel pain when I think about him, and whether cutting him out of my life is a good idea.