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In Bob's Burgers, it's clear that Zeke has feelings for Tina. When they started is up for debate though. @tacosandtouchtanks proposes that Zeke started having a crush on Tina a little before the season 5 episode, "Friends with Burger-fits" the episode that implied he had a crush on her in the first place. I'm inclined to follow that line of thinking as well because I refuse to think Zeke realized he had a crush on Tina before the season 4 episode, "Presto Tina-O". Zeke was at his worst in that episode and it still makes me mad seeing Jimmy Jr and Zeke laugh at Tina's anger (a bunch of jerks both of them, I had so many moments of being belittled when I got angry so it cut me deep seeing a character I kin go through the same).
I believe the moment Zeke starts to see Tina differently is in the season 5 episode, "Tina and the Real Ghost". Instead of getting mad that Tina would prank them in an already scary cemetery, Zeke would be super impressed by her and laugh it off later about how good she got him and the rest. More than that, he could have also been touched by her speech. While he had a lot to process about his contribution to Jeff and how he desperately wanted to believe in an afterlife, there was also Tina's reason. It's possible he could have thought later on how sad it was that all this started because Tina wanted to feel like she deserved more attention than the dismissiveness Jimmy Jr. did. Zeke couldn't understand why Jay Ju was so flaky with Tina. Zeke knew JJ liked Tina, heck he even tried to help him win her back from Josh.
Sure, Tina was creepy at times, awkward, and a fuddy-duddy. Still, even a weirdo like Tina didn't deserve to be taken for granted like that. He would give anything to have a girl like Tina like him like she likes Jay-Ju. Wait what?! What was he saying? There was no way he had a crush on Tina. This is Tina he was talking about. Sure he helped her and her siblings out in the past but he would have done that for any of his friends. After that denial, his mind would begin to recontextualize every interaction he had with her in the past. Once he was done with that he would have opened his eyes to the truth and he would have said, "Oh crap, I do like her!" While he wasn't going to deny his feelings now, there wasn't much he could do about it as long as Tina and Jimmy Jr. had whatever they had going on. Zeke was never one to give in and be a quitter though. So for now, he will just be carrying his lavender-scented torch for Tina. He doesn't plan to keep his feelings hidden, but he also won't let his feelings dictate him to not pursue other options either. His metaphorical torch will always be lit at his bedside giving him hope for the future, but won't stop him from living his best life in the present.
Once he found out that night he had a crush on Tina he would have hoped that love would be like gas and pass very soon. Little did he know love was more like appendicitis. Later, Zeke would be fine with Tina doing whatever she needed to do to figure herself out because he was confident about who would be the one to come out on top in the end. One way or another he was going to get her. One thing is for certain is that Zeke would be sure to make more of an effort to pay attention to Tina after the Jeff incident and it shows in Oeder Games. XD