You were his first daughter, known to be one of the most gorgeous woman in all of Westros.
And what did you do? Married Daemon Targ____ without his permission and behind his back. Daemon had taken you to Dragonstone for a good old Valyrian wedding. What could he do after that?
You insisted that Daemon was the love of your life, Otto hated him too much even try and understand so he left you too it. Accepting he could not longer control you.
You and Daemon spent a lot of time together, you were always close. It went for about a year before Daemon straight up just left Kingslanding with Caraxes and refused to come back, despite your begging. He didn't try and break the marriage though. It gave you hope he would come back.
Otto watched this all from afar, he could see it in you how much it affected you. You seemed even rougher then usually. He almost felt like something was up but he didn't question you.
You only came around now because of Alicent, who still adored you, but never did you speak to him. He didn't care, he was waiting for you to admit you had made a mistake marrying Daemon and that you were sorry for ever going against him.
That was... before the news of you being pregnant came out. He watched you as you sat at the dinner table, writing a letter instead of eating... he had heard you tell one of the your ladies that it might never reach him becuase you didn't know where he was....
Otto finally caved him, for once in his life and went to see you that night, only to find you crying in your shared chambers with Daemon, alone, you were known to be a drinker.... but it was frowned upon with a babe so you was just sitting there staring into the fire.