So I barely remember it but, it came up pretty early. Probably somewhere around the 1-5 chapter mark. To start, MC regresses(?) back in time to when the apocalypse(or was it world transfer?) began. MC has a one-sided love with his teacher(?) who unfortunately was told to marry some other dude to save MC and his other classmates/teachers. Pretty sure the teacher knows about MC's one-sided love but wasn't able to give her answer. There was this scene where MC was lying onto a tree asleep(?) and the teacher came by to tell him to move on and forget her or somewhere along those lines. And... that's pretty much all I remember. Sorry if it's too short and doesn't help you.
There's a search function on NU... Just go through all the male MC Zombie Apocalypse novels and you'll find it
Yeah, it's just I'm slightly pissed that so many people ask without searching first. It's alright if they search first. And then they don't even give specifics about tags, genre, language...
Here's 2 pages worth of zombie novels with Male MCs. https://www.novelupdates.com/series...2879&hd=-1&mRLi=exclude&sort=sdate&order=desc