When facing relationship breakdowns like this, I think there is a massive gap between what we rationally know and what we also can emotionally and mentally accept.
It takes time and everyone seems different in how they process such a situation and how long each stage/phase takes. I, personally, don't think it is something you can make happen or force, it happens and evolves as it does and you just have to ride it out. Of course, acknowledging unhelpful habits is good, but sometimes it just seems as if you can't make yourself do what might be the 100% best or right thing until you are ready.
One day, in my long relationship, I was able to go no contact (as I had no children with him) and it was amazing when I was able to do that. It was totally the right thing for me. I never looked him up on social media, which I used to do when trying to understand what was going on, even though I really wanted to.
To get to the point of being able to cut him off took me an incredibly long time. I knew how bad and unhealthy the relationship was a long time before I was able to cease being part of the unhealthy dynamic. Up until that point, I am sure (well I know) that some of my friends could not understand how I could continue to interact with him and have the right thoughts and feelings I was having about him.
It must have been frustrating for them on some level. The only person who understood was a friend of mine who also was in a similar relationship. She eventually left and divorced, but again her journey to being able to cut ties with him was long winded and individual to her.
This may also be helpful - about cognitive dissonance:
'[But] the one getting dumped does not get the benefit of having made a decision: the decision was made for him her. Psychologically speaking, everything is stacked in the favor of the one who initiates the breakup. Whereas the very act of breaking up makes her him more certain of her his decision, he she is left to sort through the maelstrom of negative emotions. This, to me, is where things get particularly interesting. Cognitive dissonance predicts that the more difficult the breakup is on the one being dumped, the more easy it will be for the dumper to get over it.
The cognitions, “I care about this person,” is dissonant with “My decision is causing him her pain.” But there is greater dissonance between the cognitions, “I care about this person” and “My decision is causing him her an enormous amount of pain.” There are many ways the mind can reduce the tension between the two, but the one that seems most common is to add the cognition, “I would not want to cause them this much pain if it wasn’t the right decision. Therefore I made the right decision.”
This isn’t just an exercise in psychological speculation. I have seen many friends stunned by the apparent coldness of someone they love, unable to process how quickly they have fallen from their relational bliss. Continuing with my example, it’s not the woman’s
man's insensitivity to his her pain that is causing her him to move on. In fact, it’s quite the opposite: her his acuteness to his her struggle is the very thing that’s convincing her she him he made the right decision. On the flip side of that coin, it’s easy for the dumper to get annoyed with the lingering struggle of the dumpee. But it’s important to remember that doing the dumping gives you a 90 meter head start in a 100 meter dash.'
[I changed the genders from the original and the italic sections are my highlighting]
Taken from: www.google.co.uk/amp/s/thedyingaway.wordpress.com/2014/03/04/why-breakups-are-lopsided/amp/