I'm sorry I'm not seeing an anything about affection in the guide. I have no clue what the right choices are to raise affection so I just choose what I think is right. I have looked all over for a walkthrough that will tell me what the right choices are but can't find one.
There are tabs at the bottom for navigation. The one for Zane specifically is:
https://docs.google.com/spreadsheets/d/1CjKGkKfTB3aXmScImrjptJ_K2RbyADv-1aB_B5uN...
If you scroll to the bottom of the tab you can also see the amount of affection required for each end.