I know it’s seen as a source of comedy in the TMA fandom how Jon thought Martin was gonna kill him because he showed him basic human concern, but when you think about it for more than a minute, it becomes depressing.
Jon grew up with his last parental figure left resenting him, and not wanting to deal with him. To the point he thinks he DESERVED his childhood bullies treatment of him for being annoying. He spent a day wandering around town and almost died, but we don’t really have any word of his grandma being concerned about him, or asking where the hell he’d been. The fact he sees Martin come in to his office offering tea and asking if he’s doing well, and that ringing alarm bells he has some ulterior motives feels less like just being oblivious to a crush when you know that he has always been treated like a burden to the point he’s internalized it as just him not being worth the time.