answer: David feels depressed because his girlfriend spoke ill of him and #Person1# comforts him.
documents: #Person1#: David, why don't you clean your room?
  #Person2#: I am not in the mood.
  #Person1#: Why are you feeling depress?
  #Person2#: I was told my girlfriend was speaking ill of me. It's a real letdown.
  #Person1#: I don't think she would do such a thing.
  #Person2#: But she did and it made me disappointed.
  #Person1#: Oh, cheer up! A girlfriend is not everything.
  #Person2#: But she means a lot to me.
  #Person1#: Then forgive her mistake.
  #Person2#: Oh, I just can't forget it.