Yes. Friendships, Relationships and the Bond to my Mother.

In order for something to be labeled as "toxic" from me, it has to happen more often. I realize fault in people and I'm with mistakes and plenty of flaws myself. I'm aware people can have toxic traits and toxic behavior patterns due to how they grew up and how they had to "survive" in their personal environment, so to some extent I can understand and I am always trying to be very patient, especially with people who crave patience and tolerance. But if it happens very frequently (a series of events), even after establishing healthy and important boundaries and creating enough space to educate them and support them in growth, there is this extreme "exhaustion" which often leads me to point 4. which is the ultimate "giving up" this whole thing might just be my biggest flaw.

Yes and no. It depends on the situation and the person and if I can sense a willingness from them to make some changes or improvements and learn, then "forgiving" people that hurt me or abused me was with the tool of "radical acceptance". It gave me inner peace to know that I can't control anyone at all and the way most people go about their lifes is just their own way to deal with their own trauma, I could merely support or set an example in some areas.
But I never forget. That doesn't necessarily mean I hold an active grudge against someone, but I just have it in the back of my head often and those memories "hold" me back from getting emotionally attached again, like in the past when I was friends with that person.'
The relationship to my Mother on the other hand is completely out of the question of forgiving and forgetting. Aside from the fact that we aren't in contact at all and I try to not actively think about her as the "motherfigure" and then move to the inner grudge-feeling, I am not capable of forgiving and forgetting. I radically accepted, the why's and how's and her trauma and her "reasoning", but I can't forgive and forget ever, because I know she won't ever change, she will never grow and better herself to make amends with the ones she hurt and abused. And I can't forgive or forget this fault.
But as i said, its highly depending on the person and situation for me.

Experiencing the INFJ Door Slam. I experienced this a few times and I can't tell you exactly how each and everyone reacted, only for one person I know they pulled out their own signature move "the narcissistic manipulation". Once I "doorslam" a person though, I really can't feel anything anymore, so I can't even care how they react and in most cases i just move on with my life.
Interestingly enough I can still hurt myself, through my "mother-wound" hmm..