dude was 300 year old introverted shut in and Jonak's stubborn af, so I'm not all that surprised they haven't sorted out shit between the 2 of them (≧∀≦)
They're immortal so time is basically nothing to them. If you look into Adain's reaction to Ilse's death, it subtly shown how Jonak and Adain feel/experience time. They don't have limited time as ordinary humans so they don't really count time like ordinary humans
What? So they have been together for more than 50 years already and they still haven't sorted out their feelings for each other? Dang.