Personally, I thought it was several things:
0.5) Silna was not tied to Crozier in the mystical way they were in the book. They went through hell together but ultimately Crozier's people were the cause of her sufferings (losing her father and Tuunbaq's death) and once she saved him, she did her duty and they were "even"? Also, I suppose Crozier was still recovering from his amputation (yo in good condition it can take months!) and near starvation. Where and how would he find her? The Arctic is vast and no one in the camp seemed to wish to help him find her. It would have been suicide to try to follow. She had also proven that she did not need him.
Now to what I think were the actual motivations:
1) Penance: There is no doubt in my mind that Crozier felt guilty for what happened. He had not made his voice heard with Franklin, causing them to get stuck. He sent out Fairholme even tho the monster had just killed Franklin and made a show of being hungry for white meat. He went into drinking instead of taking proper command, making him blind to the men struggles. Could he have prevented Stanley from immolating himself? And then, at the end of it all, he did not save a single one of them. Yeah, I'd feel miserable enough to disappear from the world too...
2) Shame: all of the above but, also... that was not just some people... that's Sir James Clark Ross that came to find him. That's his best friend in the whole world and a RN superstar. They went on 4 different arctic expeditions together before, survived the wreck of the Fury and came back with (almost) whole crews every time. JC Ross was also part of John Ross's disastrous expedition, when they lost the Victory and walked hundred of miles to Fury Beach. Ross's whole crew survived that while Crozier's fell like flies. Then, JC Ross and Crozier commanded Erebus and Terror to the Antarctic Expedition, a triumph... only 2 years before Crozier departed with Franklin. I feel that Crozier's personal failure would have burdened him when confronted to Ross who had never lost anything...
3) Humility and Reparation: It was undeniable that his men's actions in killing Silna's father was the trigger for their troubles. And her's. It's a mystery why she kept herself around the ships (even on her own she could have made it to her people in a week or so)... but she did and she did try to help her. Maybe Crozier saw that he had failed to conquer the North and now he must let himself be conquered? And contribute to their way of life?
4) Prospects: or rather, a lack thereof. He was not well to do (and now poorer because of the Irish Famine, which he would not know about but it still happened...), often dismissed by the Admiralty. They would never give him another command now, they might even trial and execute him for the loss of ships and crew... and , if not, he would have to go back to Sophia and Lady Franklin and tell them that Sir John died on his watch? (I think Sophia wouldn't have put that on him, but Crozier might believe differently at that time. Lady Franklin was vindicative, as shown by her mistreatment of John Rae following his reports of cannibalism). So, really, there was nothing left for him in England. Except his friendship with Ross and his connections to Edward Parry and Col. Sabine. But even those previous connections did not help him advance in his career and, as for Ross... see point 2).
So, I think the showrunners based their characters closer to the historical counterpart (although they did get stuff wrong) which means that...
Yeah, Crozier is a whole different character from the book (and so is Silna) so he would not have the same motivations.
I admit I couldn't finish the book. I went half way through and then there was one too many mention of a middle aged man having an erection to a teenager. Also Simmons basically called JCR incompetent wtf. Maybe I would get it if I forced myself to finish it but I just don't even understand what the whole deal with Silna and Crozier was 😅... the show's ending is the one that makes sense to me, ahah...
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