answer: Jack is down because he broke up with Jane. #Person1# tells him to cheer up, but Jack thinks it's hard to forget her at moment.
documents: #Person1#: Hi, Jack, how have you been?
  #Person2#: Not very well.
  #Person1#: Why? Looks like you're feeling very down! What happened?
  #Person2#: Nothing.
  #Person1#: Come on. For a man who's feeling so, down, there're usually two reasons. Either his career is going downhill, or he has a broken heart. Since you're so successful, it must be the latter.
  #Person2#: Well, you're right. I just broke up with Jane.
  #Person1#: Oh, I'm sorry. I thought you two were made for each ocher.
  #Person2#: Well, you never know. I'm ready for a commitment and want to settle down, but she says she wants to pursue her career while she's still young.
  #Person1#: Well, she is not to blame. It's always difficult to choose between career and family.
  #Person2#: Maybe you're right.
  #Person1#: Jack, I don't know what to say to comfort you, but cheer up! There are plenty of fish in the sea and you'll find your soul mate, your perfect match!
  #Person2#: Yeah, but it's hard to forget her at moment. You know, we were together for almost five years. It's really hard...