answer: #Person1# tells #Person2# that Jack and Mary broke up because Jack was cheating on Mary. #Person2# thinks they are not suitable together because of different personalities and they hope Mary will recover soon.
documents: #Person1#: Jack and Mary broke up.
  #Person2#: it's so sad. They had been together for only two months. Do you know what the matter was?
  #Person1#: Mary said Jack was cheating on her. Jack was seeing a girl from his hometown. One day, Mary saw them holding hands and ended the relationship immediately.
  #Person2#: really? I'm very surprised. He doesn't look like a guy who'd ever do that sort of thing, right?
  #Person1#: no, he doesn't. Anyway, she found out that he had been two-timing her for a long time.
  #Person2#: maybe it is for the best. They are not suitable for each other because they have nothing in common and are completely different people.
  #Person1#: how so?
  #Person2#: he is an extrovert while she is an introvert. He likes parties while she hates them.
  #Person1#: poor Mary! She really liked him.
  #Person2#: anyway, she was right to end things and she deserves better.
  #Person1#: do you think they'll get back together?
  #Person2#: no, I don't think so. I know Mary. Once she makes a decision, she won't change her mind.
  #Person1#: I hope she'll recover soon.
  #Person2#: so do I.