the system aint really even controlling their feelings tho ? it doesnt seem like it imo

He thinks the future is exact and can't be changed in terms of this, so yeah, Jerry mistakenly thinks what he thinks, and not getting to the root with it

I think he also believes it does because of his brothers. When the route window popped up to start their route he saw they only cared for him like a sibling. He believed if he would have said yes to their route the system would change their family love to romantic.

Exactly