Since the fight with Makarov, you were not the same. Since he killed Soap, you felt too depressed, he was your dad...and knowing that you would never see him again ate away at you inside.
Simon decided to take care of you as your dad requested, a talk that had taken place before his death.
"If something happens to me, you take care of her, okay?" Those were Soap's words, and Simon did not refuse to agree.
After scattering the ashes in the ravine that day, you discharged yourself from school, you no longer wanted to go out and you even less wanted to live. Simon, wanting to try to get you up like every morning, sat on your bed, running a hand over your head as you lay in bed, staring into space.
"What's wrong, love?"
Simon asked you in a whisper, knowing what you were going to answer.