I have this strange complex in which I door-slam some and yet let others trample on me indefinitely.
I suppose it has something to do with the context, but I'm not completely sure...
My husband, for example, is one that I never could shut out, even after a very rough few years of dating (and many, many hurtful breakups). I loved him so much and was so magnetized to him that I never could or would allow myself to shut him out. I just kept forgiving him.
Then there is a half-sibling who repeatedly has tried to claw her way into my life now, when I am an adult, although she cared very little about me when I was a child. I doorslammed her around the age of 18 and have absolutely no emotional attachment to her, despite her being somewhat blood-related. She crossed the line many times, though, before I finally stopped pretending to care about her and just started ignoring her completely.
There are also times where someone crosses the line and I want to completely shut them out, but circumstances require that I do not. It's in these cases that I feel especially vulnerable, and essentially "go through the motions" of having a relationship with them without allowing them to be close to me, in order to protect myself. It's especially hard to forgive these people in situations like these (it may prove impossible; I suppose I'll find out).
Overall, I would sum up my reaction to boundary-crossing into stages like this:
1. I make excuses for the other party but am hurt deeply, and try extremely hard to win affection.
If the person changes behavior at this point (and does not apologize), I forgive and move on immediately.
If they apologize, I'm likely to deflect it and deny it hurt me in the first place.
2. I internalize the hurt even deeper, and try harder to please.
If the person changes the behavior at this point (and does not apologize), I am hesitant to trust, but will forgive after I believe the behavior is authentic.
If they apologize, I'm likely to accept the apology but downplay its necessity, and forgive and move on immediately.
3. My hurt begins to turn to anger, and I become guarded.
If the person changes the behavior at this point (and does not apologize), I am very slow to trust and forgive, but it is definitely possible.
If they apologize, I am likely to forgive, acknowledge that I was hurt, and move on.
4. I become defensive and withdraw emotionally.
If the person changes the behavior at this point (and does not apologize), I will struggle with forgiveness but after a while of seeing the changed behavior, move on and trust again.
If they apologize, I am likely to forgive, acknowledge that I was hurt, and give them another chance to try, albeit hesitantly.
5. I withdraw verbally and/or physically, and become indirect and avoidant to conflict
If the person only changes the behavior at this point (and does not apologize), I will likely not pursue a relationship with them further.
If they apologize, I am likely to forgive, but to wait for a change in behavior before trying again in the relationship. If the change comes, I am likely to move on and begin building trust towards them again.
6. I decide the relationship is not worth keeping and "doorslam" - attempts to keep harmony in the relationship are abandoned at this point, and I may be more willing to pursue, or at least accept, open conflict.
If the person only changes the behavior at this point (and does not apologize), I will not accept any type of relationship with them.
If they apologize, I am likely to forgive, but not to give them another chance at a relationship. It is highly unlikely that, once I've reached this stage, I will want any type of relationship with them again- although, sometimes, time can heal and years later I am able to have an acquaintance relationship again.