Shino has led such a tragic life of loss, i think Nozomi genuinely wants to care for her, not out of pity, but because she loved Shino's brother and thus loves what he loved (Shino). But Nozomi still feels like there is distance or Shino refuses to show her vulnerability, so perhaps that is why Nozomi is getting excited but also a bit anxious, because the is both getting closer to Shino but also fears that if she pushes too hard on their relationship Shino might again out up walls.