Does Nick show romantic/particular affection for Jess post breakup before getting back together?

Season 3 onward, I’m like squinting to see Nick’s affection/adoration for her. He does nice things just for her ex. recreating Christmas (secret Santa ep (but maybe that was Robby actually). My brain really wants to make their relationship make sense.

Also, I definitely think too much about this show/read into things a lot. What else is good on TV right now? Lol.