First, Diana tries to make a run for it by leaving Sandy in a hotel room. She then notices his phone ringing and answers it, hearing his daughter's voice, and she breaks down in tears, knowing she can't go through with it.
The second happens when she reveals to Sandy that she doesn't even know her real name. She cries while telling him nobody gave a shit about her growing up.
Unintentionally Unsympathetic: Diana almost ruined a hard working man's life, so her suddenly being a sad and sympathetic person is jarring for some.