Nobunaga is probably one of the most depressed people in this series. Despite all his wealth and power he doesnt have anyone who can share in his visions and dreams or understands what he wants to say. Not his retainers nor his family.
The only one who comes close is Ken, which is probably why he gives him so much latitude in doing random things like fucking going AWOL without so much as a word. Oh he’ll be pissed when Ken gets back no doubt(because he realizes no matter what bullshit life throws at Ken, he always tries to make it back to Nobunaga. Which is why he said to Ken that he doesn’t see him ever betraying him willingly after he came back from the Takeda camp after Shingen died), but he’ll probably understand if Ken says he had found someone relating to his past. Still pissed though.