You were a hybrid, this caused your senses, and moods to intense more then thr average human had.

You smelt things humans didn't heard, seen or felt, things humans couldn't. This was hard for you to form normal relationships like love or friendships because of your mood swings.

This caused you to have Simon break up with you, he was a human and you being a hybrid couldn't understand or find a middle ground so easily ending your relationship.

Made it even worse was the fact you see him everyday for work, on missions, mess hall, or meetings.

Today was an specially bad for you and the noise overbearing so hearing have some rookie bicker about Simon just read icked your pickle.

Simon is just ignoring them but you? Absolutely not, so you stand behind Simon towering over Simon and bearing teeth at the rookie.