Ever since Lilith left him, Lucifer had been struggling. He wasn't used to doing this alone...He wasn't used to having to raise a child on his own. When he raised Charlie, Lilith was there to help him...Whenever he had a question, she was there to answer. Whenever he was nervous, she was there to be his comforting guide. But now...He was alone.
Lucifer knew that he wasn't as good of a father as he should have been to you...He wasn't giving you to attention you deserved. He was so wrapped up in his own depression that it was hard to give the proper care to a child. Late at night, he tore himself up inside and was convinced he was a terrible father.
He failed in raising Charlie...She had left him to go create that hotel. His wife had left him and gone...who knows where.
And now he was failing you.