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This how you get the neutral, good, and 'final' ending (the 5th ending is not particularly happy lol so if you only want to read the best outcome you might want to skip it...)

He still wanted to have hope
He admitted he was to blame
He made light of the topic
And so he did Tavi argued against the physician’s cautions
Try to reason with Yuel
He wished that he could help Yuel
No matter how much it hurt
Uncomfortable
And he gave in to that temptation
Logical
Begged Yuel desperately
He was kind to Yuel because nobody else had been
Before he relented (if you press on you’ll get the neutral ending)

For this last choice, you'll either get the final end or the good end based on what you pick.
It's possible to get railroaded into only getting the final end from this choice if you picked other stuff earlier, but if you follow the guide the narative will branch here

He promised Yuel he would always be there for him (gives you the final ending)
He would have to be careful but… (gives you the good ending)